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Integer signum() Method in Java

Last Updated : 19 Aug, 2021

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

Syntax : 

public static int signum(int a)

Parameter: The method takes one parameter a of integer type on which the operation is to be performed.

Return Value: The method returns the signum function of the specified integer value. If the specified value is negative it returns -1, 0 if the specified value is zero, and 1 if the specified value is positive.

Examples:  

Consider an integer a = 27
Since 27 is a positive int signum will return= 1
 
Consider another integer a = -61
Since -61 is a negative int signum will return= -1
 
Consider the integer value a = 0
For a zero signum, it will return = 0

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

Program 1:  


Output: 
1
-1
0

 

Program 2: 


Output: 
-1
1
0

 

Program 3: For a decimal value and string. 
Note: It returns an error message when a decimal value and string is passed as an argument.


Output: 
prog.java:10: error: incompatible types: possible lossy conversion from double to int
 System.out.println(Integer.signum(3.81));
 ^
prog.java:14: error: incompatible types: String cannot be converted to int
 System.out.println(Integer.signum("77"));
 ^
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
2 errors

 
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