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Long signum() Method in Java

Last Updated : 05 Dec, 2018

The signum function also known as sign function is an odd mathematical function that extracts the sign of a real number. The java.lang.Long.signum() method is used to get the signum function of the specified long value. For a positive value, a negative value and zero, the method returns 1, -1 and 0 respectively.

public static int signum(long num)

The method accepts one parameter

of long type on which the signum operation is to be performed.

The method returns the signum function of the specified long value. If the specified value is:

• Negative, the method returns -1.
• Zero, the method returns 0.
• Positive, the method returns 1.

Input: (Long) 2731766
Output: 1

Input: (Long) -233611 
Output: -1

Input: (Long) 0
Output: 0

Below programs illustrate the Java.lang.Long.signum() Method:

// Java program to illustrate the
// Java.lang.Long.signum() Method
import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {

        // It will return 1 as long value is greater than 1
        System.out.println(Long.signum(36565531));

        // It will return -1 as long value is less than 1
        System.out.println(Long.signum(-628127));

        // Returns 0 as long value is equal to 0
        System.out.println(Long.signum(0));
    }
}

For decimal value and string.

// Java program to illustrate the
// Java.lang.Long.signum() Method
import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {

        // It will return compile time error
        System.out.println(Long.signum(36565.531));

        // It will return compile time error
        System.out.println(Long.signum("628127"));
    }
}

prog.java:10: error: incompatible types: possible lossy conversion from double to long
    System.out.println(Long.signum(36565.531));
                                   ^
prog.java:13: error: incompatible types: String cannot be converted to long
    System.out.println(Long.signum("628127"));
                                   ^
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
2 errors

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