Kotlin While Loop

While Loop statement is used to execute a block of code repeatedly based on a condition.

In this tutorial, we will learn the syntax of While Loop statement, and its usage with the help of example programs.

Syntax

The syntax of While Loop statement is

while (condition) {
    statements
}

while: Kotlin keyword.
condition: a boolean expression, or something that evaluates to a boolean value.
statements: one or more Kotlin statements. This can be empty as well, if necessary.
() parenthesis enclose the condition, and {} curly braces enclose the while loop body.

Examples

1. Print numbers from 1 to N using While Loop

In this following program, we will use While Loop to print numbers from 1 to n.

Main.kt

fun main() {
    var n = 4

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

Output

2. While Loop with break statement

In this following example, we will use while loop to print numbers from 1 to infinity. We use break statement inside While Loop to break the loop after printing the number 4.

Kotlin Program – example.kt

fun main() {
    var i = 1
    while(true){
        println(i)
        i++
        if(i > 4)
            break
    }
}

Output

Conclusion

In this Kotlin Tutorial, we learned how to use while and do while loops in Kotlin.

Kotlin While Loop