Kotlin program to check if a number is positive or negative

Comprehensive Collection of Kotlin Examples

In this program, you will learn to check if a given number is positive or negative. This can be done by using if in Kotlin-or when expressions to complete.

To check if a number is positive or negative, compare it with 0.

• If the number is greater than zero, it is positive.

• If the number is less than zero, it is negative.

• If the number is equal to zero, it is zero.

Example1: Check if a number is positive or negative using if else statements

fun　main(args:　Array<String>)　{
　　　　val　number　=　12.3
　　　　if (number < 0.0)
　　　　　　　　println("$number is negative.")
　　　　else if (number > 0.0)
　　　　　　　　println("$number is positive.")
　　　　else
　　　　　　　　println("$number is 0.")
}

When running the program, the output is:

12.3　It is positive.

This is the equivalent Java code:Java program to check if a number is positive or negative.

The if else statements in the above program can also be replaced with the when expression.

Example2：Check if a number is positive or negative using the when expression

fun　main(args:　Array<String>)　{
　　　　val　number　=　-12.3
　　　　when　{
　　　　　　　　number　<　0.0　->　println("$number　是负数.")
　　　　　　　　number　>　0.0　->　println("$number　是正数.")
　　　　　　　　else　->　println("$number　为　0.")
　　　　}
}

When running the program, the output is:

-12.3　Is a Negative Number.

Comprehensive Collection of Kotlin Examples