StrictMath signum() Method in Java

Last Updated : 3 Aug, 2018
  1. The signum(double num) is an inbuilt method of StrictMath class in Java which is used to get the signum method of the argument which means:
    • The result is zero if the argument is zero.
    • The result 1.0 when the argument is greater than zero.
    • The result is -1.0 if the argument is less than zero.
    Syntax : 
    public static double signum(double num)
    Parameters : The method accepts a single parameter num of double type representing the parameter whose signum is to be returned. Return Value : The method returns signum function of the argument num. It also gives rise to two different results:
    • The result is NaN when the first argument is NaN .
    • The result is the same as the argument num when num is positive zero or negative zero.
    Examples: 
    Input: num = 72.88d
Output: 1.0

Input: num = -72.88d
Output: -1.0

Input: num = 0.0d
Output: 0.0
    Below program illustrates the working of java.lang.StrictMath.signum(double) method. java 
    // Java praogram to illustrate the
// java.lang.StrictMath.signum(double)
import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {

        double num1 = 46.82d, num2 = 0.0d, num3 = -0.0d, num4 = -18.2d;

        // It returns 1.0 since the argument is greater than zero
        double sig_val = StrictMath.signum(num1);
        System.out.println("Signum Value = " + sig_val);

        sig_val = StrictMath.signum(num2);
        System.out.println("Signum Value = " + sig_val);

        sig_val = StrictMath.signum(num3);
        System.out.println("Signum Value = " + sig_val);

        sig_val = StrictMath.signum(num4);
        System.out.println("Signum Value = " + sig_val);
    }
}
    Output: 
    Signum Value = 1.0
Signum Value = 0.0
Signum Value = -0.0
Signum Value = -1.0
  2. The signum(float num) is an inbuilt method of StrictMath class in Java which is used to get the signum method of the argument which means:
    • The result is zero if the argument is zero.
    • The result 1.0 when the argument is greater than zero.
    • The result is -1.0 if the argument is less than zero.
    Syntax : 
    public static float signum(float num)
    Parameters : The method accepts a single parameter num of float type representing the parameter whose signum is to be returned. Return Value : The method returns signum function of the argument num. It also gives rise to two different results:
    • The result is NaN when the first argument is NaN .
    • The result is the same as the argument num when num is positive zero or negative zero.
    Examples: 
    Input: num = 11.8f
Output: 1.0

Input: num = -55.88f
Output: -1.0

Input: num = 0.0f
Output: 0.0
    Below program illustrates the working of java.lang.StrictMath.signum(float) method: java 
    // Java praogram to illustrate the
// java.lang.StrictMath.signum(float)
import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {

        float num1 = 7.22f, num2 = 0.0f, num3 = -0.0f, num4 = -18.11f;

        // It returns 1.0 since the argument is greater than zero
        float sig_val = StrictMath.signum(num1);
        System.out.println("Signum Value = " + sig_val);

        sig_val = StrictMath.signum(num2);
        System.out.println("Signum Value = " + sig_val);

        sig_val = StrictMath.signum(num3);
        System.out.println("Signum Value = " + sig_val);

        sig_val = StrictMath.signum(num4);
        System.out.println("Signum Value = " + sig_val);
    }
}
Output: 
Signum Value = 1.0
Signum Value = 0.0
Signum Value = -0.0
Signum Value = -1.0
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