Java - Math signum(double x) method

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Description

The Java Math 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.Special Cases −

• 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.

Declaration

Following is the declaration for java.lang.Math.signum() method

public static double signum(double d)

Parameters

d − the floating-point value whose signum is to be returned

Return Value

This method returns the signum function of the argument

Exception

NA

Example: Getting signum for a Positive double Value

The following example shows the usage of Math signum() method to get a long value for a positive double value.

package com.tutorialspoint;
public class MathDemo {
   public static void main(String[] args) {

      // get a double number
      double x = 1654.9874;

      // find the signum of the value
      System.out.println("Math.signum(" + x + ")=" + Math.signum(x));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Math.signum(1654.9874)=1.0

Example: Getting signum for a Negative double Value

The following example shows the usage of Math signum() method to get a signum of a negative double value.

package com.tutorialspoint;
public class MathDemo {
   public static void main(String[] args) {

      // get a double number
      double x = -9765.134;

      // find the signum of the value
      System.out.println("Math.signum(" + x + ")=" + Math.signum(x));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Math.signum(-9765.134)=-1.0

Example: Getting signum for a Zero double Value

The following example shows the usage of Math signum() method to get a value of a zero double values.

package com.tutorialspoint;
public class MathDemo {
   public static void main(String[] args) {

      // get double numbers
      double x = 0.0;	  

      // find the signum of the value
      System.out.println("Math.signum(" + x + ")=" + Math.signum(x));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Math.signum(0.0)=0.0