Quick Answer: What Is Difference Between While Loop And Do While Loop?

What is Loop example?

A loop is used for executing a block of statements repeatedly until a particular condition is satisfied.

For example, when you are displaying number from 1 to 100 you may want set the value of a variable to 1 and display it 100 times, increasing its value by 1 on each loop iteration..

What is an example of do while loop?

The do while loop is an exit controlled loop, where even if the test condition is false, the loop body will be executed at least once. An example of such a scenario would be when you want to exit your program depending on the user input.

What is the difference between while loop and do while loop in Java?

What are the differences between while loop and do-while loop in Java? The while loop in java executes one or more statements after testing the loop continuation condition at the start of each iteration. The do-while loop, however, tests the loop continuation condition after the first iteration has completed.

What is the difference between for and while loop?

The ‘for’ loop used only when we already knew the number of iterations. The ‘while’ loop used only when the number of iteration are not exactly known. If the condition is not put up in ‘for’ loop, then loop iterates infinite times. If the condition is not put up in ‘while’ loop, it provides compilation error.

How does a while loop start?

The while statement creates a loop that is executed while a specified condition is true. The loop will continue to run as long as the condition is true. It will only stop when the condition becomes false. … do/while – loops through a block of code once, and then repeats the loop while a specified condition is true.

Where do while loop is used?

The while loop is used to repeat a section of code an unknown number of times until a specific condition is met. For example, say we want to know how many times a given number can be divided by 2 before it is less than or equal to 1.

How does while loop work?

Overview. The while construct consists of a block of code and a condition/expression. The condition/expression is evaluated, and if the condition/expression is true, the code within all of their following in the block is executed. This repeats until the condition/expression becomes false.

Can you put a while loop in a for loop?

All for loops can be written as while loops, and vice-versa. Just use whichever loop seems more appropriate to the task at hand. In general, you should use a for loop when you know how many times the loop should run.

Do While and while loop are same true or false?

Because do while loops check the condition after the block is executed, the control structure is often also known as a post-test loop. Contrast with the while loop, which tests the condition before the code within the block is executed, the do-while loop is an exit-condition loop.

What is for loop while loop and do while loop?

A do.. while loop is almost the same as a while loop except that the loop body is guaranteed to execute at least once. A while loop says “Loop while the condition is true, and execute this block of code”, a do.. while loop says “Execute this block of code, and then continue to loop while the condition is true”.

When should we use do while loop?

Learn how to use a do while loop to set up a block of code to repeat as long as a conditional statement is true. The do-while loop is used when you always want to execute a block of code at least once.