Kotlin If Statement

In this tutorial, you shall learn about the If conditional statement in Kotlin, its syntax, and how to write an If statement in programs with examples.

Kotlin If

Kotlin If-statement conditionally executes a block of statements. If-statement has a condition and a block of statements.

If the condition evaluates to true, then the block of statements in If-statement will execute, else the execution continues with the statement(s), if any, after the If-statement.

Syntax

The syntax of If conditional statement is

if (condition) {
    //code
}

The condition should be a boolean expression, or must evaluate to a boolean value.

Examples

1. Check if N is even number using If-statement

In the following Kotlin program, we have an integer value in n. We shall check if this integer is even or not, using if statement. If n is the value in which the integer is, then the condition to check if n is even is n%2 == 0.

Main.kt

fun main(args: Array<String>) {
    val n = 10
    if (n%2 == 0) {
        print("$n is even number.")
    }
}

Output

10 is even number.

2. Check if N is odd number using If-statement

Now, let us check if n is an odd number or not.

Main.kt

fun main(args: Array<String>) {
    val n = 9
    if (n%2 == 1) {
        print("$n is odd number.")
    }
}

Output

9 is odd number.

Conclusion

In this Kotlin Tutorial, we learned what is If statement in Kotlin, and how to use it to write conditional statements, with the help of example programs.