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Java - Math.signum() Examples

[Last Updated: Nov 8, 2025]

Java Java API 

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Class:

java.lang.Math

java.lang.Objectjava.lang.Objectjava.lang.Mathjava.lang.MathLogicBig

Methods:

public static double signum(double d)

Returns the signum function of the argument; zero if the argument is zero, 1.0 if the argument is greater than zero, -1.0 if the argument is less than zero. 



public static float signum(float f)

Returns the signum function of the argument; zero if the argument is zero, 1.0f if the argument is greater than zero, -1.0f if the argument is less than zero.


Examples


package com.logicbig.example.math;

public class SignumExample {

    public static void main(String... args) {
        findSignum(4.2);
        findSignum(2.5);
        findSignum(-8.75);
        findSignum(0.0);
        findSignum(0.0 / 0);
    }

    private static void findSignum(double d) {
        double result = Math.signum(d);
        System.out.printf("Math.signum(%s)  = %s%n", d, result);
    }
}

Output

Math.signum(4.2)  = 1.0
Math.signum(2.5)  = 1.0
Math.signum(-8.75)  = -1.0
Math.signum(0.0)  = 0.0
Math.signum(NaN)  = NaN




package com.logicbig.example.math;

public class SignumExample2 {

    public static void main(String... args) {
        findSignum(1.75f);
        findSignum(3.5f);
        findSignum(-7.25f);
        findSignum(0.0f);
        findSignum(0.0f / 0);
    }

    private static void findSignum(float d) {
        float result = Math.signum(d);
        System.out.printf("Math.signum(%4s)  = %s%n", d, result);
    }
}

Output

Math.signum(1.75)  = 1.0
Math.signum( 3.5)  = 1.0
Math.signum(-7.25)  = -1.0
Math.signum( 0.0)  = 0.0
Math.signum( NaN)  = NaN

See Also