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. Syntax :

public static int signum(long num)

Parameters: The method accepts one parameter num of long type on which the signum operation is to be performed. Return Value: 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.

Examples:

  Input: (Long) 2731766  Output: 1    Input: (Long) -233611   Output: -1    Input: (Long) 0  Output: 0

Below programs illustrate the Java.lang.Long.signum() Method: Program 1:

java

// 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));     } }

Output:

  1  -1  0

Program 2: For decimal value and string.

java

// 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"));     } }

Output:

    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

Long signum() Method in Java

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Long signum() Method in Java

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