Java Math - signum() Method

The Java signum() method returns the sign of a given value. It returns zero if the argument is zero, 1.0 if the argument is greater than zero, -1.0 if the argument is less than zero. The method can be overloaded and it can take double and float arguments. In special cases it returns the following:

• If the argument is NaN, then the result is NaN.
• If the argument is positive zero or negative zero, then the result is the same as the argument.

Syntax

public static double signum(double x)
public static float signum(float x)

Parameters

Return Value

Returns zero if the argument is zero, 1.0 if the argument is greater than zero, -1.0 if the argument is less than zero.

Exception

NA.

Example:

In the example below, signum() method returns the sign of a given value.

public class MyClass {
 public static void main(String[] args) {
  System.out.println(Math.signum(10)); 
  System.out.println(Math.signum(-10)); 
  System.out.println(Math.signum(0)); 
 }
}

The output of the above code will be:

1.0
-1.0
0.0