# Do While Loop In Java – % Software Testing Material

In Java, a do-while loop is used to iterate through a block of code until the test expression evaluates to false. The test expression is evaluated after each iteration of the code block. This means that the code block will always execute at least once before the condition is checked.

In Java, a do while loop is a type of control statement that allows you to repeat a block of code while a condition is true. The do while loop will always execute the code block at least once before checking the condition. If you need to execute a set of statements multiple times and the number of iterations is not known in advance, then you can use a do while loop.

For example, you might want to keep prompting a user for input until they enter the correct information. In this case, you would use a do while loop so that the prompt appears at least once. The syntax for a do while loop is:

do { // Statements } while (condition); Notice that there is no semicolon after the closing brace of the code block. This is because the semicolon goes after the condition statement.

Here’s an example of how to use a do while loop:

## While Loop Java

Java provides a number of ways to iterate over collections of data, or even just over a single value. The most common way to do this is with a for loop, which lets you specify how many times the code should run. However, sometimes you don’t know how many times you need to run the code in advance.

In these cases, you can use a while loop. A while loop will keep running as long as the condition you specify is true. For example, if you want to print out all the numbers from 1 to 10, you could use a while loop like this:

while (i <= 10) { System.out.println(i); i++; } This code will print out the numbers 1 through 10 on separate lines. Notice that we have to increment i manually each time around the loop; otherwise, it would just keep printing out 1 forever!

You can use a while loop for all sorts of things – not just counting up numbers. You can use it to process user input until they enter an valid option, or read data from a file until you reach the end of the file. As long as your condition can eventually become false (or there’s some other way to break out of the loop), a while loop can be useful tool in your Java programming arsenal.

## Java Do-While Loop With User Input

A do-while loop is a type of loop that will execute at least once, and then continue to run until the specified condition is no longer met. This makes it different from a while loop, which will not run at all if the initial condition is false. To create a do-while loop in Java, you need to use the following syntax:

do { // Statements } while (condition); The statements inside the do block will always be executed at least once, before the condition is checked. If the condition evaluates to true, then the statements will be executed again. This process will continue until the condition evaluates to false.

It’s important to note that the Condition must be placed at the end of the do-while loop, after the closing curly brace. Placing it anywhere else will result in a compilation error. An example of a do-while loop would be asking a user for input, and only continuing with program execution if that input meets certain criteria:

Scanner sc = new Scanner(System.in); int input; do { System.out.print(“Enter an integer greater than 0: “); // Prompt user for input input = sc.nextInt(); // Read in user input } while (input <= 0) ; // Repeat until input > 0

In this example, we’re prompting the user for an integer greater than zero using a print statement. We’re then reading in their response with nextInt(). The value entered by the user is stored in our int variable called “input”. Finally, we have our do-while loop condition – which checks if “input” is less than or equal to zero (<=0). As long as this evaluates to true – meaning they haven’t entered a valid number yet – our code block containing the prompt statement will execute again. Once they enter an integer greater than zero – meaning <0 evaluates to false – program execution will move on outside ofthe do-while loop .

## For Loop Java

A for loop is a type of looping statement in the Java programming language. It provides a way to repeat a block of code multiple times, making it ideal for situations where you need to perform an operation on a set of data or objects. The syntax for creating a for loop in Java is:

for (initialization; condition; increment) { // Statements } Where initialization is the starting value for the loop variable, condition is the test expression that determines when the loop should terminate, and increment is the value that should be added to the loop variable each time through the loop. Here’s an example of how you could use a for loop to print out all even numbers between 1 and 10:

## Do While Loop in Java W3Schools

In Java, the do-while loop is used to iterate a block of code continuously until the given condition is true. It is important to note that the do-while loop will always execute the code block at least once before checking the condition. The syntax of a do-while loop in Java is:

do { // Statements inside the body of the loop } while (condition); where,

• Statements: Statements that need to be executed inside the body of the loop.
• Condition: The condition is checked after each iteration, and if it evaluates to true, then the statements inside the body of the loop are executed again. If it evaluates to false, then execution continues outside of the loop.

## Difference between While And Do-While Loop in Java

There are two types of loop in java, while and do-while. While is a type of loops which check the condition first and then execute the code inside its body. On the other hand do-while loop is also a type of loops which execute the code first and then check the condition.

Now let’s see difference between these two types of loops with the help of an example: Suppose we want to print numbers from 1 to 10 using while loop. The code will be like this: int i = 1; while(i<=10) { System.out.println(i); i++; }

Now if we want to do same thing using do-while loop, then the code will be like this: int i = 1; do{ System.out.println(i); i++; }while(i<=10); As you can see in both codes, we have initialized variable ‘i’ with value 1 and wanted to print values till 10 (including 10).

Both codes will work perfectly fine but there is one major difference between them that is when they will execute for first time.

## Do Loop Java

In Java, the do-while loop is a control flow statement that executes a block of code at least once, and then repeats the execution until a given condition is no longer met. The do-while loop is similar to the while loop, except that the do-while loop always executes the body of the loop at least once before checking the condition. This means that if the condition is false on the first check, the body of the loop will still be executed once.

Syntax: do { // Body of loop } while (condition); The following example shows how to use a do-while loop in Java: int i = 0; do { System.out.println(i); i++;

## While Java

. . Java is a versatile and powerful programming language that enables developers to create robust, high-performance applications. Java is the primary language for developing Android apps, and is also widely used in server-side web applications, enterprise software, and scientific computing.

While Java is a relatively easy language to learn, it’s important to remember that it is a statically typed language, which means that variables must be declared before they can be used. This can seem like a tedious process at first, but it ultimately leads to more reliable and error-free code. In addition, because all type declarations must be made upfront in Java, the compiler can catch errors early on in the development process.

One of the most unique aspects of Java is its platform independence, which means that programs written in Java can run on any operating system or device that supports the Java Runtime Environment (JRE). This makes Java ideal for cross-platform development and deployment.

## How to Stop Do-While Loop in Java

When you want to stop a do-while loop in Java, there are a few different ways that you can do it. One way is to use the break keyword. The break keyword will immediately exit out of the loop and continue executing the rest of your code.

For example: while (true) { System.out.println(“Hello, world!”); break; // exits out of the loop } Another way to stop a do-while loop is by using the return keyword.

The return keyword will also exit out of the loop, but it will also return from the method that contains the loop. For example: public void printHelloWorld() {

while (true) { System.out.println(“Hello, world!”); return; // exits out of both the method and the loop }

## What is a Do While Loop in Java?

A do while loop is a type of loop that will execute its code block at least once, and then repeat the code block until the condition specified evaluates to false. The main difference between a do while loop and other types of loops is that the condition for a do while loop is checked after the code in the code block has been executed, rather than before. This means that if the condition for a do while loop always evaluates to true, then the code in its code block will be executed an infinite number of times.

The syntax for a do while loop looks like this: do { // Statements inside the body of the loop go here… }while(condition); // Note that there is no semicolon after the closing parenthesis! The condition can be any expression that returns a boolean value (true or false). In most cases, this will be a comparison between two values, but it doesn’t have to be.

Here’s an example of how a do while loop might be used: int count = 1; do { // Execute at least once!

## Do While Loop Examples in Java?

Do while loops in Java are a type of loop that executes a block of code at least once, and then continues to execute the block of code until the condition is no longer true. The syntax for a do while loop is: do {

// Statements } while (condition); The difference between a do while loop and a regular while loop is that a do while loop will always execute the block of code at least once before checking the condition.

With a regular while loop, the condition is checked first, and if the condition is false, the code in the block will never be executed. Here’s an example of a do while loop: int x = 1; do { System.out.println(“value of x:” + x ); x++; }while(x < 10);//exit when x becomes greater than 10

In this example, we print out the value of x until it becomes greater than 10. So we’ll see output like this:

## What is Do While Loop Example?

A do while loop is a type of loop that will execute a block of code at least once, and then continue to repeat the block until a specific condition is met. The condition is typically tested at the end of each iteration, meaning that the code in the block will always run at least once. Here’s an example of how a do while loop might be used:

int x = 0; // initialize x to 0 do { // this code will run at least once Console.WriteLine(x); // print out the value of x x++; // increment x by 1 } while (x < 10); // keep repeating while x is less than 10 In this example, the code in the block will print out the values 0 through 9 (inclusive) before stopping. That’s because we start with x=0 and increment it by 1 each time through the loop, so it will eventually reach 10 which is when our exit condition is met.

## Do While And While Loop in Java?

While and do-while loops are two of the most important control structures in Java. They allow you to repeating a block of code until a certain condition is met. In this article, we’ll take a closer look at how they work and when you should use each one.

A while loop will execute its code block as long as the condition is true. For example, let’s say we want to print out the numbers from 1 to 10. We can use a while loop like this: int i = 1; while (i <= 10) { System.out.println(i); i++; } This code will print out the numbers 1 through 10 on separate lines.

The key thing to note here is that the condition (i <= 10) comes before the code block ({ … }). This means that the code block will execute at least once, even if the condition is false from the start. If you want your code block to only execute if the condition is true, then you need to use a do-while loop instead.

A do-while loop works similarly to a while loop, except that the code block comes before the condition. So our previous example would become this: int i = 1; // initialize variable i=1 for counting number // starting point for difference b/w ‘do’ & ‘while’ statement //as in case of “do” it won’t check any kind of condition first it just run or execute first then after execution it checks for any kind of given conditions .

//like in our case we have initialized value or starting point as 1 so it just printed value from 1to10 without checking any kind fo conditions.. //whereas in case of “While”statement it just checks for conditions first then after satisfactiong all given conditions only it executes or run statements inside curly braces {} do { System.out.println(i); i++; } while (i<=10);//ending point

## Conclusion

Do While Loop in Java Do while loop is a control flow statement that allows code to be executed repeatedly based on a given condition. The condition is checked at the beginning of each iteration.

If the condition is true, the code block inside the do while loop will be executed. Once the code block is executed, the condition is checked again and the process repeats itself until the condition becomes false. Assuming that you have some basic knowledge of Java programming, let’s take a look at how do while loops work in Java.

We’ll start with a simple example that prints out the numbers 0 to 10. Here’s the code: int i = 0; do { System.out.println(i); i++; } while (i <= 10); In this example, we’ve created an integer variable called i and assigned it a value of 0. We then use a do while loop to print out the value of i as long as it is less than or equal to 10.

As you can see, our code block consists of just one line – System.out.println(i); – which simply prints out the value of i on each iteration. Finally, we have our while statement which contains our conditional expression (i <= 10).
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