StrictMath signum() Method in Java

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 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 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