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Categories: Android Tutorial

while & do while Loop in Kotlin

Kotlin do-while loop
Like Java, do-while loop is a control flow statement which executes a block of code at least once without checking the condition, and then repeatedly executes the block, or not, it totally depends upon a Boolean condition at the end of do-while block. It contrast with the while loop because while loop executes the block only when condition becomes true but do-while loop executes the code first and then the expression or test condition is evaluated.

do-while loop working –
First of the all the statements within the block is executed, and then the condition is evaluated. If the condition is true the block of code is executed again. The process of execution of code block repeated as long as the expression evaluates to true. If the expression becomes false, the loop terminates and transfers control to the statement next to do-while loop.

It is also known as post-test loop because it checks the condition after the block is executed.

Loop is used in programming to repeat a specific block of code until certain condition is met (test expression is false).

Loops are what makes computers interesting machines. Imagine you need to print a sentence 50 times on your screen. Well, you can do it by using print statement 50 times (without using loops). How about you need to print a sentence one million times? You need to use loops.

As I mentioned in the beginning of this guide, a do-while loop will at least run once even if the given condition returns false. This happens because the do-while loop checks the condition after execution of the loop body.


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