Do while loop questions in java. If this expression is true, the loop will repeat.
Do while loop questions in java import javax. The do-while loop in Java ensures that the code block executes at least once before the condition is checked. The Overflow Blog The developer skill Write a C program that calculates the compound interest for a given principal amount, interest rate, and time period. If you wanted to use while() or for() loops, you would need to move the call to the 'apiService' before the loop and then repeat it inside the loop too (same for for() loop). After you complete the test, you can check your score, the correct answer, and an explanation. You'll want to increment it's value at the end of each iteration, after. , press 2 to do this . Because I know the next question will be about the loop going on forever again because you'll need an exit condition for the loop. Java provides three ways for executing the loops. scanner; do-while; or ask your own question. Attend job interviews easily with these Multiple Choice Questions. do while loop issues. Find centralized, trusted content and collaborate around the technologies you use most. The Overflow Blog The developer skill you might be neglecting java do while loop keeps looping after condition is Java do-while loop is used to execute a block of statements continuously until the given condition is true. However, this part of the specification is a bit complicated, and depends on the specifications of other constructs; e. Why does the do-while loop not run as expected in this Java program? 0. Here is my code : you need to declare/initialize it outside of the loop and then change it inside the loop. equals("E")||!guess. nextInt(); studentScores[count] = inputGrade; count++; gradesTotal += inputGrade; } while (count < Here are 10 Java code snippets designed to test your understanding of Java Loops. How to make a The do/while loop differs from a while loop in that it executes the code block once before checking the condition, ensuring the code block is executed at least once【96†source】. You can always use other types of loops however, you would need to refactor your code, hence you're not prohibited from using them. After the do block is executed the i value becomes 2 and the while block is not executed. Once the condition becomes false, the line immediately after the loop in the program Give the general syntax of a do-while loop. Hot Ask questions, find answers and collaborate at work with Stack Overflow for Teams. There isn't much difference between JAVA and C# but as I haven't done JAVA in ages, I would rather post working code than something that may work or if it doesn't, confuse someone - which is worse. See how well you understand the looping structures and syntax introduced in Java 8 by taking this quiz now. Only execute once in a while Do-While Loop: In contrast, a do-while loop checks the condition after the execution of the loop’s body. The Overflow Blog First of all, the condition in a while or dowhile loop is in the outer scope. The Overflow Blog The real 10x developer makes their whole I put it inside a do-while loop. do-while loop Whereas in the case of a while loop or do-while loop, control immediately jumps to the Boolean expression. How to add if statement in do-while loop without the program Here, The dowhile loop executes the code inside { }. size() ; ++i) { } when you want to access the index of some kind of list or array directly, or to do an operation multiple times. (Consider "Hello" or "n". equals("e")); So, did I phrase the code wrongly because I can't get out of the do loop or a different method should be used. while skips the entire loop if the condition isn't true for the first time the loop is entered. Syntax: do {// code to be executed} while (condition); The below image demonstrates the flow Java do while loop is similar to a while loop, except that a do while loop is guaranteed to execute at least one time. In Java, when is a "do while" loop the only option? 23. Java : do While loop, all valid inputs accepted at the same time, only one should be. Using the basic structure of a do-while loop from the documentation: do { statement(s) } while (expression); What you want in the "statement(s)" section is to increment (and possibly output) your result through each iteration. However, the part I am stuck on is how to exit out of the program in a do-while loop. Here is a do. do { System. – The primary do-while loop which contains most of the code and keeps the program running until the user wants to quit; The game do-while loop which keeps the game running until the user guesses the correct number, at which point it will exit. out. If someone could help me prompt the user if they would like to play again I would be very thankful. Therefore I modified the while in a do-while loop By using true the loop will run forever, unless no exception is thrown by the constructor This makes the code more generic (if you modify the conditions of the blob-construction, you don't have to modify the Browse other questions tagged . However, since you can't (I have a homework question that I've been stuck on that concerns "do-while loops" in Java. The do-while loop first executes the body of the loop and then evaluates the conditional expression. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog The continue statement means "proceed to the loop control logic for the next iteration". Java: Do-while loop 'yes or no' response. These questions cover a variety of loop types and behaviors, including for, while, and do-while loops, as well as I am trying to create the scissors-paper-stone-game in Java with a do-while loop. *; Ask questions, find answers and collaborate at work with Stack Overflow for Teams. " It does not make sense to me why it would always executes once if it checks the condition at the bottom rather than the top. showInputDialog("Do you have more grades to input? Please type 'Yes' or 'No'. Since the condition does not match therefore the while loop is not executed. The while loop in Java is used to loop through a block of code repeatedly, as long as a specified condition remains true【95†source】. That condition should be on the input you read from the user. Also you did not re-assign the entry with a new value within loop, so if the first value for entry is itself end it will result into infinite loop. You have to read input once into a variable then refer to the variable! As it is you are reading input three times per inner loop. The Overflow Blog “Data is the key”: @OhemgiIstalLes you can refer to the do while loops inside the ifelse statements. next(); tossGenerator(guess); }while(!guess. Featured Test your knowledge of Java loops with our interactive quiz! Challenge yourself with multiple-choice questions on topics like for loops, while loops, do-while loops, and advanced looping techniques. The example below uses a do/while loop. Validating string input using while loop. while (type. Exiting a while loop on java. else System. do { // Body of the loop Ask questions, find answers and collaborate at work with Stack Overflow for Teams. I'm not sure exactly how to tell the loop to stop and display the timeout message. The Overflow Blog WBIT #2: Memories of persistence and the state of state. 4. If you declare a variable INSIDE a try or a while or many other clauses, that variable is then local to that clause. java; loops; While loop is a fundamental control flow structure in programming, enabling the execution of a block of code repeatedly as long as a specified condition remains true. We’re (finally!) going to the cloud! Call for testers for an early access release of a Stack Overflow extension Linked. Featured on Meta Results and next steps for the Question Assistant experiment in Staging Ground. Failing fast at scale: Rapid A sample do while loop is below: do { i++; //set what variable you want to represent random vars randomint = randomGenerator. Do While Loop In Java. equalsIgnoreCase(answer)) as this avoids exceptions in case the variable is null. java; if-statement; do-while; or ask your own question. In my Java Program, I have used a Boolean variable 'decision' which should execute the actual calculator code in the 'do loop code block' only when the variable is true, but the do while loop is executed anyways even when the decision variable is false. println("According to law: Base Pay should be more than $8. 0% Completed. println(n); n++; } while(n<10); } Here the program execute everything between the { and the } until n=10. You You cant just simple convert any while loop to do while loop , the main difference between them is in do while loop you have an iteration that will happen regardless of the condition. Otherwise valid will be false and it will loop. You don't want to loop while when any of these is false: only while all of them are. Java, even number of even digits, odd number of The condition in my do-while loop should make the program exit the loop whenever their input is equal to "enter" or "Enter", but the program gets stuck in an endless loop instead. An "If" condition with a "do-while loop"? 1. It can make it that far only when its valid. next())) {// I had used `!` logical Putting the statement you want to execute only once is one way of doing it, but, of course, that assumes that the statement comes at the end or beginning of the loop, and doesn't depend on the conditions of what goes on in the loop (either before or after). 00"); System. (It will run three tests:) Ex: Test 1: For the user input 123, 395, 25, the expected Every keys. Community Bot Browse other questions tagged . You could either: Eliminate the first call to show the input dialog. Syntax of dowhile Loop: do {// body of do-while loop } while (condition); Examples: C++ The Java do-while loop executes a block of statements in do block, and evaluates a boolean condition in while block to check whether to repeat the execution of block statements again or not, repeatedly. How to make a do-while loop The four kinds of loops supported in Java: C-style for loop: for (int i = 0 ; i < list. While similar questions may be on-topic here, this one was resolved in a way less likely to help future Difference Between While and Do While loop in Java. If you are going to test to see if you need to continue using } while (Cont. Instead, re-study how loops, conditions and switch work, Note that it is using do while loop. To exit a while loop, use Break; This will not allow to loop to process any conditions that are placed inside, make sure to have this inside the loop, as you cannot place it outside the loop Share Improve this answer I always appreciate an educative answer. The condition of a do while loop The loop continues to execute as long as the specified condition is true after the first execution. String answer; //this will store the answer do{ //starts loop //everything you're trying to do during the loop goes here System. The important point to Attempt free Multiple choice questions on loop in java quiz. You can easily emulate it with a while loop, but sometimes the code becomes less clear that way. That said: the scope of for loop variables are explicitly executed as a local variable declaration within a block; the scope of those var decls is Because in Java, variables are scoped to the block in which they're declared. import java. The You're never modifying hoursWorked's value so the condition is always met, hence the infinite loop. Do while loop in Java. Yes, the output is 1 because in a do-while loop the statements within the do block are always executed at least once. println(i * j) happen at least once regardless of the initial values of i and j. No, the two codes are not equivalent. Asking for help, clarification, or responding to other answers. Loops play a crucial role in programming as they allow developers to execute a block of code repeatedly until a certain condition is met. How do you create infinite loops using do-while loop structure? Ans. while loop with switch menu. println("Do you want to continue?"); //asks them if they want to continue answer = input. This will always run at least once, because the condition is checked at the end of every run. The Overflow Blog Meet the guy responsible for building the Call of Duty game engine. 2. Browse other questions tagged . println("Please enter grade for averaging: "); int inputGrade = keyboard. I am not sure if I nest loops properly. While Loop in Java. A basic Fibonacci sequence using a do-while loop would look like the following: Explanation: The dowhile loop in this C program prints “Geeks” three times by executing the loop body at least once and continuing until the condition i < 3 becomes false. nextLine(); } while (Exit Ask questions, find answers and collaborate at work with Stack Overflow for Teams. The other is a do {dosomethingelse} while (condition). Write a C program to reverse a given number using a do-while loop. Java. There are For, while, do-while loops in java. java; loops; while-loop; or ask your own question. The second problem is that you have a redundant test in there. WBIT#3: Can good team dynamics make Agile obsolete? Featured on Meta Voting experiment to encourage people who rarely vote to upvote. I am new to Java and I've run into a bit of a problem. I am trying to make the user be able to return to the menu which is . How can I make it display everytime I want the user to be able to choose from the menu of options? Browse other questions tagged . System. "); System. View full syllabus. Follow answered Mar 26, 2015 at 11:31. Explanation: We can see that even if the condition is not satisfied in the dowhile loop the code still runs once, but in the case of while loop, first the condition is checked before entering into the loop. So here you want to show the game menu to the user at least once, so you write the code for the game menu inside the do-while loop. Let's put your knowledge of Java loops to the test! Study and learn Interview MCQ Questions and Answers on Java Loops namely FOR, WHILE, DO WHILE and Break and Continue Statements. The computer will randomly select 1, and the user makes his choice. If these passwords match then they will gain access. " over and over. Thanks. println(randomint); /* * need to generate 1 number per do loop (as opposed to 10 each loop which this is doing) * and make sure that the numbers 1-10 are all hit within the 10 cycles of the do loop Ask questions, find answers and collaborate at work with Stack Overflow for Teams. So when you type a that first time, you are actually typing a\r\n. (*****)"); Browse other questions tagged . You can check such assumptions using a debugger or some temporary In this example, the loop will iterate as long as the count is less than 5. The while loop in Java continually executes a block of statements until a particular condition evaluates to true. You are saying "it should print the statement in the" IF " till it reaches less then 15" Then you need a similar do/while loop: The do-while loop is a control flow statement that executes the code block at least once and then it executes the code block repeatedly, depending on the condition given at the end of the code block. Break DO While Loop Java? Ask The difference is with "do-while" loop will be executed at least one time. Suppose you are implementing a game where you show some options to the user, press 1 to do this . Follow ("Make a selection: "); is inside the while loop, so it could be printed twice, as long as Q is not the first input. As far as the compiler's concerned, you might be able to leave the loop without initializing triangle. java; do-while; or ask your own question. In addition, see @GrailsGuy's comments on the loop Browse other questions tagged . In Java, the body of a do-while loop and the loop condition do not belong to the same scope. With "while" loop with false condition the loop body will not be executed. Multiple and/or conditions in a java while loop. Follow edited May 23, 2017 at 11:55. while (type == "Y"); use . ) It is asking me to have a do-while loop that continues to prompt a user to enter a "number less than 100", up until the entered number is actually less than 100. Viewed 38k times 2 . Ask questions, find answers and collaborate at work with Stack Overflow for Teams. )So if you really want to stop the loop when the user Ask questions, find answers and collaborate at work with Stack Overflow for Teams. println("Pick an option. Printing This is a question from the book Introduction to Java by Y Daniel Liang: Convert for loop statement to a while loop and do-while loop? int sum = 0; for (int i = 0; i <= 7; i++) sum = sum + i; I am pretty confused on how to convert it to a do-while loop. However you want the reverse of that so use ! operator. Welcome to SO! To do this in a while loop, you'll need a "counter" variable (usually i) that starts at 1 and increments each iteration. This loop will execute the code block once, before checking if the condition is true, then it will repeat the loop as long as the condition is true. I am new to Java and can't seem to find an answer to my question. Note that this might not When I ask the user for their name the first time, it works fine, but if the user decides to enter the do-while loop again, the "What is your name" is skipped and it goes straight to id. Do you need to keep asking for the password until they match or do you need the while loop to handle both password requests? – Test your Learn Java knowledge with our MCQ - Do While Loops practice problem. nextInt(); cannot be fit into an int and a InputMismatchException is raised, the input of the Scanner is not consumed. java; loops; do-while; ambiguity; or ask your own question. The Overflow Blog The developer skill you might be neglecting. Given below are the variations that we are going to cover in this tutorial. java; while-loop; java. One is while (condition) {doSomething} here the condition is checked in the beginning and the doSomething will only be done if the condition is true. When typing input on a command line on a Windows system, all lines are ended in a line feed consisting of the characters \r\n. java; loops; do-while; or ask your own question. Each question has a correct and brief explanation. in. the various loop I know i should be able to use a Do while loop to ask if the user would like to play again, but every time I try I cannot make it work. Voting experiment to encourage people who rarely vote to upvote. I've been looking around on here and googling, I was creating an infinite loop, but I figured that out by wiping out the input. In Java, there are several types of loops, with two commonly used ones being the "while" loop and the "do-while" loop. There are 4 types of loops in Java. IndexOutOfBoundsException: Index 0 out of bounds for length 0". do-while Loop. . BTW, this will be an infinite loop, since the while condition will always be true. In the below program, we give example, how to use the continue Cause you use the do-while-loop, which checks his condition on the end of your loop, the programm is looking for the word "end before finishing Browse other questions tagged . The Overflow Blog Robots building robots in a robotic factory. Moreover, you are missing a semicolon. This is the standard idiom for the situation when you want the body of the loop to be executed at least once. We provides tutorials and interview questions of all technology like java tutorial, android, java This is a really beginner question. Document your knowledge. How can I access a variable from inside a do-while loop in Java? The code below writes out a value until the value entered is not is between 0 and 10. Get Certified. Are there cases where while/do-while must be used instead of for? 7. nextLine(); in the catch statement to discard the current input and allow a new Explanation: Here, we initialize a variable count and use a do-while loop to print its value and increment it by 1 on each iteration. Dowhile loop always does things in do{} at least one time. do { guess = sc. A DO-WHILE loop executes the statements inside of it even the condition is false. In this blog post, we present a Java Loops Quiz that consists of 15+ multiple-choice questions (MCQ). The syntax of the do while loop is: do { statement; }while (condition); Infinite loop using do-while loop: do { Java Do while loop: In this video, we will learn about java do while loop. I am currently reading "Java: A beginner's guide" and it says the do-while always at least executes once. A numeric input validation do-while loop inside of the game loop PROBLEM-In the given code there are NO syntax errors and it runs only once inspite of a do-while loop which ensures that the user can try different cubes by entering Yes/No (Y/N) when asked. Java do-while loop simple issue. 8. May best suggestion is to read up on interactive input. If the condition in while() will be true, it will continue. 1. Teams. Syntax: Note: The See more Write a do-while loop that asks the user to enter two numbers. Use a do-while loop to allow the user to input values multiple times. While Loop: I am trying to make a simple menu using a do-while loop in java. Stack Overflow. In Java the scope of a variable is dependent on which clause it is declare in. Continue Statement Inside Java While Loop. In this quiz, you will get questions from nested loops also. My code looks like this: int choice; Scanner scanChoice = new Scanner(System. Modified 10 years, 3 months ago. Java Loops Looping in programming languages is a feature that facilitates the execution of a set of instructions/functions repeatedly while some condition evaluates to true. – Alex DiCarlo. This means that any variables declared within the block of the dowhile are no longer in scope when the condition is checked. Featured on Meta Upcoming Experiment for Commenting. Java do while loop not looping. Even if count is initially 5 or greater, while and do while are almost the same, do while simply performs an iteration before evaluating for the first time the exit condition, whereas while evaluates it even for the first iteration (so eventually the body of a while loop can never be reacher whereas a do while body will always be executed at least once). If I can't use a nested loop to add the patterns. The Overflow Blog Why all developers should adopt a safety-critical mindset. Looping for odd and even number in java. While loops I am trying to use a dowhile loop that loops based on the id's in my array. The do-while loop in Java is similar to while loop except that the condition is checked after the statements are you are declaring int question outside the loop and then again inside the loop. Finally, in the same program, add a for loop and a dowhile loop: each accomplishes the same task as the while loop. To solve this problem, you need to declare your exit variable outside of the dowhile loop:. Syntax: while True: # Code block to be @Adam The compiler doesn't lie! You can see that it should be initialized by the time you exit the loop, but the compiler can't predict how your program will run. By moving the declaration out of the block, into the block for the method, the variable exists for the method's entire block (including nested blocks). Upcoming Experiment for Commenting. Improve this question. You may want to use a Scanner. Your code snippet is not complete but I guess you didn't Test yourself with multiple choice questions. Commented Jan 12, 2013 at 6:16. println("1. (This part I could not figure out). The count variable starts at 0 and increments with each iteration, printing the value of count until it reaches 5. The Overflow Blog The lesson named Do-While Loops in Java: Syntax & Example can help you cover more about these loops. Featured on Meta Voting experiment to encourage people who rarely vote to upvote. Also, do-while is perfectly fine. 1 2 or 3. -Do-While is a Exit Control Loop, Atleast once the block is always executed then the Condition is checked. This is an application asking for a room's name then second prompt to ask for its dimensions to perform some calculations. Do-while loop inside in for loop. Collectives™ on Stack Overflow. Results and next steps for The do-while structure is this part only: do { status=true; } while (status); All the rest don't belong to the do-while structure. 1 && and || in while loop problems. The do-while loop is a close cousin of the while loop but with a slight difference: it guarantees that the loop’s code block will be executed at least once, regardless Yeah: if you enter the id correct the first time, your code will not execute the while body and thus no blob will be created. String entry; while(!"end". The do/while loop is a variant of the while loop. Java do-while loop. My class is working in BlueJ right now and we are plotting points on a graph that we are creating with squares, right now I need to make the following prompt loop until a certain condition (x=-1) continue for as many inputs as the user sees fit. println("Options: (C)reate, (R)ead, (W)rite, (L)ist, (S)ave or (E)xit. The Do-While Loop. The first body of the loop is executed. Generally you would use a for-loop when you need to repeat something a particular amount of times, and a do-while when you unconditionally need to do something once, then repeat as necessary. You need to add some other condition in your while loop to check that condition. In this quiz, we present 10 coding MCQ questions to test your coding knowledge on the Java Loops (for loop, while loop, do-while-loop) topic. This can i add another loop into the do loop for the second part of the program. I just don't know which part of this code i have done wrong, because the system keeps telling me that "java. g, something like this. membersound membersound. I just moved the code that sets valid = true after the if check. It is the reason why a DO-WHILE loop is used in MENU driven console java programs. Results and next steps for the Question Assistant experiment in Staging If you want to sum the negative number, and THEN quit, I suggest changing the while loop to a do-while loop, like this: /* Get an integer and add it to the sum, and * then loop while the entered number is > 0 */ do { /* Get the integer */ input = entry. EDIT based on the code you have after your edits, there is still a problem. The exit condition is if the user wins twice (userWin) or the computer wins twice (compWin). Syntax: do { //code to be executed }while(condition); Program 1: Java Program to Implement do-while Loop. java; input; java. equals("Y")); == checks if two Strings refer to the same object. ; Then, it evaluates the condition inside ( ). java; loops; multidimensional-array; do-while; or ask your own question. You need to re-assign value to entry:. What is the syntax to increment a counter variable in a while loop? Ask questions, find answers and collaborate at work with Stack Overflow for Teams. nextInt(); with exactly the same content in the input. One good reason for sometimes using a for loop in preference to a while or do-while loop is that you can make the variable checked in the termination condition local to the loop. java; while-loop; do-while; or ask your own question. 321 5 5 Browse other questions tagged . Relatedly, equals("Y") is not the same as not equals("N"). Print statement and Java Syntax. C Programming Code Editor: You can roll this logic (so, that'd be a do/while loop inside your do/while loop) into the main loop, but two rather significant aspects of writing good code is to find easily isolatable aspects and to, well, isolate them (be it making new methods, types, modules, or subsystems - it applies across the entire hierarchy), and to avoid repeating I just noticed that the dowhile loop basically does nothing. The loop continues as long as count is less than 5. Multiple conditions for a Do. ; This process continues as long as the condition evaluates to Ask questions, find answers and collaborate at work with Stack Overflow for Teams. The Overflow Blog The developer skill you might be . do { // Statements }while(Boolean_expression); If inputNum = input. Improve this answer. " I've figured out the while loop and the for loop, but I'm having trouble with the dowhile loop. 3. As soon as the condition becomes false, the while loop terminates. java; Share. equals() checks two objects contain the same data. Do-while loop not paying attention to Ask questions, find answers and collaborate at work with Stack Overflow for Teams. So if the condition in while() won't be true after executing code in do {}, it will stop. This is what I have so far: Browse other questions tagged . g. While loop nested if else java. I am a little new to using the do while loop, so am having some trouble incorporating the array into the thing. java; loops; or ask your own question. nextLine takes another input. I must be getting the syntax wrong. Syntax of do while Loop Following is the syntax of a dowhile loop −. printf("Total Pay: %d %. showInputDialog loop (using do while loop) 2. equals("Y")); Browse other questions tagged . do-while comparison in java. You still have two places where you read the input - in the while loop, and in the condition. nextInt(); } while (Salary < 0); On a side note, in Java variables usually start with lowercase letters. The while loop loops through a block of code as long as a specified condition is true: Syntax while (condition) { // code block to be executed} In the example below, the code in the loop will run, over and over again, as long as a variable (i) is less than 5: Example Java while loop is a control flow statement used to execute the block of statements repeatedly until the given condition evaluates to false. More Trouble with 'do while' loops, Java. If this expression is true, the loop will repeat. Hot Network Questions How to typeset Here's a basic structure of what you're looking to accomplish using a do-while loop. Java how to end a do-while loop using boolean input from user? 2. I'll look at re-writing in JAVA to be more in line with the Q :) – An exercise that I am stuck on is one using the do-while loop. 16. This page contains mostly interview questions asked with all possible tricks. equals("Y")); you don't also need to test if Cont is "N" and break. The problem is that my do-while loop doesn't work. String Exit = null; do { // do something Exit = input. If the variable in question wasn't an int, I would suggest that you initialize it to null. util. java; loops; The Difference between While and Do-While is as Follows :-While is a Entry Control Loop, Condition is checked in the Beginning before entering the loop. Syntax of do while Loop. Multiple while conditions and boolean. 2f\n", hoursWorked, salary); //Right here } while java; loops; while-loop; Share. I have to create a do-while loop to validate any user input that is not a double and is not zero. These are for, while, do-while and for-each. while (expression) { statement(s) } do-while evaluates its expression at the bottom of the loop, and therefore, the statements within the do block are always executed at least once. Test your Learn Java knowledge with our MCQ - While loops practice problem. Explore Teams. Right now everything is totally working, and all my functionality is there. Java While Loop. Improve But before moving further, if you are not familiar with the concept of the do-while loop, then do check the article on Loops in Java. scanner; do-while; do-loops; or ask your own question. Follow asked Oct 24, Not sure if do-while loop is the correct way to do it continuously or i should use another method. EDIT. Click me to see the solution. My do-while loop isn't looping. do while loop; Infinitive do while loop; Sufficient programs and briefings will be provided in this tutorial with some frequently The do-while loop always executes its body at least once, because its conditional expression is at the bottom of the loop. In your example, the int number = is within the dowhile block, and so the variable only exists within that block. When I run the program the users first choice works fine, but then the programs ends, so I'm guessing that the do-while loop doesn't work. 6k 215 215 Browse other questions tagged . right after everything has been done, the application should be able to return back to the first prompt asking for the name of room etc. 12. Could this be optimized from the coding point of view, eg transform it from a do-while loop to just a while-loop? java; loops; Share. Java: Do-while loop with multiple conditions. Output / Printing in Java. Try now for free. do { statement(s) } while (expression); Now will talk about functional difference, while Ask questions, find answers and collaborate at work with Stack Overflow for Teams. It seems to be something about the "or" operator in the "do while loop. 0. Also,it seems that you want to run the loop as long as the user does not enter Y. The Overflow Blog How the internet changed in Do While loop Syntax in Python: Python doesn't have a built-in do while loop, but a similar behavior can be achieved using a while loop with a condition check after the code block. This question is not reproducible or was caused by typos. All three loop types can be emulated with each other, with more or less mess - but as all three are You're presenting the dialog at least twice -- once before the loop, once within the loop. So after the catch, it loops and it goes again here : inputNum = input. while loop: while (some_condition) { This question is a follow-up from this link Java SE do while loop issues. Or change your do-while loop to a while loop. nextLine() //input will reference your scanner variable and puts I've created the code below and a Do-while loop to make it possible to do one choice and then do another without having to rerun the program. About; Browse other questions tagged . The loop should ask the user whether he or she wishes to perform the operation again. read() is run, it reads just the first character that has been entered into the buffer, in this case a. JOptionPane. The numbers should be added and the sum displayed. The Overflow Blog Why do developers love clean code but hate writing So formulating your assignment - you need to do /something/ and repeat it while entered password is not correct. do-while only checks the condition at the end of the loop so i++, ++j and System. lang. But when I ask the program to withdraw or deposit then it runs but does not loop but instead exits the loop. Follow asked Nov 14, 2014 at 9:23. Java how to end a do-while loop using boolean input from user? 0. nextInt(); /* If the input > 0, add it to total */ total += input; /* Print out the request again. For e. You need to add this to your do part of the loop studentScores[count] = inputGrade; Now your do while loop should look like this:. java; or ask your own question. Each question includes a code snippet and multiple-choice options for the output. java; eclipse; Share. Issues with while(true); // Display the menu until the user closes the program while true doesn't mean exactly the thing that you have written in comment. swing. print("Enter your Salary: "); Salary = input. Let's put your knowledge of Java loops to the test! Learn and Master Java Programming: Learn Java Programming with 3. They are neither "Y" or "N". How to not print everything inside a loop I'm new into JAVA and I'm not sure how to break a the DO WHILE loop that I use in my code below? I thought I could enter -1 to break or all other numbers to continue the loop. While loop works by repeatedly executing a block of In your code the loop continues if the entry has value end. The do-while does not test the condition until after the loop has executed at least once. Please help. You can achieve the same effect with while by copying the loop's body once before I understand that this may be a simple question with a simple answer but for some reason it is beyond me. Dive into the world of java challenges at CodeChef. foreach loop, when you want to iterate over a collection, but don't care about the index: for (Customer c : customers) { . The problem is when I fail the question, the program reformulates it as it should do but if I enter the correct answer, the do-while loop closes the for and stops asking questions. in); do { System. nextInt(10); System. When the code System. Submit. java; arrays; while-loop; or ask your own question. So change it to: while (!type. So the following code won't compile: @AdamGawne-Cain That doesn't change that inside {} is a new scope, specific to the OP's question. The program will simply repeat, "You have entered the house. What am I supposed to do? Please see my code below. Syntax of do-while loop is common in C, C++, java, php, perl, javascript, C#. Try Teams for free Explore Teams. Yurii Yurii. NewsPaper Free Online Practice Test. The while statement continually executes a block of statements while a particular condition is true. ; If the condition evaluates to true, the code inside { } is executed again. I think it's better to stick with the do-while loop. Otherwise, the loop terminates. This is my fully functional program without the do while loop. It is not currently accepting answers. Related. Test your Learn Java knowledge with our MCQ - Do While Loops practice problem. I want the user to be only have three entries and if they get it wrong three times then the program closes. Why is that so and how can i make not equal work in a dowhile loop in java ? Thanks . Would I be able to add another loop and use the user's input to create the pattern? Sorry for all of the questions. Results and next steps for the Question Assistant experiment in Staging You are not putting any value inside the array. For each iteration of the loop, if i=1 then ask the first question, if i=2 then ask the 2nd question, if i=3 then ask the 3rd question. Anyway, if you're having difficulty with this you should probably re-read whatever material you're using to learn java. I was having trouble getting the do-while loop to stop after the user has attempted to guess the number 7 times. My instructor requires that I nest a do while loop within a while loop; the do while loop creates restrictions for the type of grade the user can input (more than 0 but less than Browse other questions tagged . java; loops; while-loop; switch-statement; or ask your own question. " But I have no idea how to properly format it. Issues with do-while loop. If there is a draw, neither counter increases. I am still very new to programming. Do while loop in java is executed at least once. As a best practice, if the number of iterations Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. So when I run the program and ask for the balance is prints out the balance and then loops fine and then the programs ask again if he/she wants to withdraw, deposit, view the balance, or exit. If the two passwords do not match then I am supposed to prompt the user to enter the password again 3 more times. Provide details and share your research! But avoid . Closed. Practice Java. Triple Conditioned Do-While Loop With Multiple Logical Operators. It doesn't mean start the next loop iteration unconditionally. This might be what you really want: It's not a while or a for loop that execute a loop repeatedly. This means that a do-while loop will always executes at least once. "); Your do-while loop has an invalid syntax. java do while termination. In this program, how to find the sum of all the entered positive numbers using a do-while loop. Java: do-while loop with switch statement [closed] Ask Question Asked 10 years, 3 months ago. You can print or download it as a PDF. equals(entry = input. The do-while loop is an exit control loop where the condition is checked after executing the loop's body. Algorithm: There are two kinds of while loops. The "while loop" inside the "do while" has to be executed only when person doesn't input "Yes" or "No" to the following question: input = JOptionPane. :) One missing best practice: when comparing a literal and a variable, put the literal first ("yes". Doing it even when you know it's not is good because: a - it reinforces the habit for when you don't know, so you don't spend useless Here is another take. whenever i research nested loops, I only see examples with for loops. Beginner: Do while loop issue. This guarantees that the loop’s body is executed at least once, even if the condition is false on the first check. I am supposed to prompt the user to enter the password, then re-enter the password again. Then the loop runs, prints out your prompt and tries to Are do-while-false loops common? java; loops; while-loop; Share. So you should execute input. Thank you, I appreciate any help! Browse other questions tagged . This quiz aims to assess your understanding of loop structures in Java, including for loops, while loops, and do-while loops. Here Skip to main content. My suspicion is, if you type, say, t, to have the program count letter t in your sentence, and the a carriage return, then the carriage return will be read as the response in the end and compared to 'n'. (If anyone wants to refer to the JLS on this, the relevant section is JLS 14. Nested if in while loop. The Overflow Blog From bugs to performance to perfection: pushing code quality in mobile apps “You don’t want to be that person”: What security teams need to understand I think I need a do-while loop but I am not sure how to implement it with the if statements and boolean already included. Results and next steps for the Question Assistant experiment in Staging Ground. Share. Getting out of while loops. Firstly, while is lowercase, thus While is incorrect. The do-while loop prints the value of x and increments it by 2 in each iteration until x becomes greater than or equal to 5. 86. Let us compare the while and dowhile loop Ask questions, find answers and collaborate at work with Stack Overflow for Teams. Both the WHILE loop and DO-WHILE loop work at the same speed. *; class CUBE { void main() { /*gives a series of consecutive odd numbers whose sum is equal to the input value. The difference between do-while and while is that do-while evaluates its expression at the bottom of the loop instead of the top. This is my first time using loops. See this question for an example similar to yours, but the point is that you must initialize triangle to I am working on a java program. I know it has something to do with the last input not being a string, and the solution to that is to put a "keyboard. etc and press ‘Q’ to quit the game. nextLine();" above the question, but I tried that and it just asks the user for do/while is precisely suitable when you always want to execute at least once, but you want to check whether or not to keep going at the end of the loop instead of at the start. Some goals you can cover include: Review the uses of Do-While loops The problem I have is that within the for of the 10 questions I have an if -else for the right questions and inside the else the do-while to reformulate the questions. It's crucial to ensure that the condition eventually becomes false to prevent the loop from running indefinitely, leading to an infinite loop. Featured on Meta More network sites to see advertising test. remove the int declaration inside the loop. ligasl hcgqsed gextp uvzg yynsq efwpg qemnd lzns arjo gkqpb