Kotlin While Loop

In Kotlin, a while loop is a control flow statement that allows us to execute a block of code repeatedly based on a condition. The while loop executes as long as the condition is true.

Syntax

The syntax of the while loop in Kotlin is as follows:

while(condition) {
    // block of code to be executed repeatedly
}

In the above syntax, the condition is a boolean expression that is evaluated before executing the block of code. If the condition is true, the block of code is executed, and the process repeats. If the condition is false initially, then the code block is skipped.

Example

Let's take an example to understand the while loop in Kotlin. In this example, we will print the numbers from 1 to 5 using a while loop.

var i = 1
while(i <= 5) {
    println(i)
    i++
}

The output of the above code will be:

1
2
3
4
5

Explanation

In the above example, we have initialized a variable i to 1. We then use a while loop with the condition i <= 5. As long as the condition is true, the block of code inside the loop is executed, which is to print the value of i using the println() function, and increment i by 1 using the i++ statement. This continues until the value of i becomes 6, which is when the condition becomes false, and the loop is terminated.

Use

The while loop is useful in scenarios where we need to repeat a block of code based on a condition. Some examples of its use cases in Kotlin are:

• Reading input from the user until a specific condition is met
• Repeating a process until it satisfies a particular condition
• Processing data from a file until the end of the file is reached

Important Points

• A while loop repeatedly executes a block of code based on a condition.
• The condition must be a boolean expression that is evaluated before the execution of the code block.
• It is essential to include a step to ensure that the condition will eventually be false; otherwise, the loop will run infinitely.

Summary

The while loop is a control flow statement in Kotlin that allows us to repeat a block of code based on a condition. In this loop, the block of code is executed repeatedly as long as the condition is true. It is important to ensure that a while loop will eventually terminate by including a step to update the condition. It can be useful in scenarios where we need to repeat a process based on a specific condition.