Kotlin If NOT

In this tutorial, you shall learn how to use NOT logical operator for the condition of If-statement in Kotlin, with examples.

Kotlin If with NOT Operator

The condition in If-statement can be negated using Logical NOT Operator !.

The following is a simple scenario where the condition is negated with Logical NOT Operator.

if ( !condition ) {
    //code
}

The truth table for the result of the expression !condition is

condition	!condition
true	false
false	true

Example

In the following Kotlin program, we have an integer value in a. We shall check if this integer is not even.

The expression to check if a is even is a%2 == 0.

The expression to check if a is not even is !(a%2 == 0).

Main.kt

fun main(args: Array<String>) {
    val a = 13
    if ( !(a%2 == 0) ) {
        print("$a is not even.")
    }
}

Output

13 is not even.

Conclusion

In this Kotlin Tutorial, we learned how to use Logical NOT Operator in If-statement’s boolean condition, with the help of example programs.