Long signum() Method in Java
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:
import java.lang.*;
public class Geeks {
public static void main(String[] args)
{
System.out.println(Long.signum( 36565531 ));
System.out.println(Long.signum(- 628127 ));
System.out.println(Long.signum( 0 ));
}
}
|
Program 2: For decimal value and string.
import java.lang.*;
public class Geeks {
public static void main(String[] args)
{
System.out.println(Long.signum( 36565.531 ));
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
Last Updated :
05 Dec, 2018
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