Java Integer signum() Method

The signum() method of Java Integer class returns the signum function of the specified int value in the method argument. The signum function can be computed as:

-1, if the specified number is negative.
0, if the specified number is zero.
1, if the specified number is positive.

Syntax:

Following is the declaration of signum() method:

Parameter:

DataType	Parameter	Description	Required/Optional
int	i	Integer value whose signum is to be computed.	Required

Returns:

The signum() method returns the signum function of the specified int value in the method argument.

Exceptions:

Compatibility Version:

Java 1.5 and above

Example 1

public class IntegerSignumExample1 {
	public static void main(String[] args) {
	    System.out.println("Result: "+Integer.signum(8));
	    System.out.println("Result: "+Integer.signum(-50));
	    System.out.println("Result: "+Integer.signum(0));
	}
}

Output:

Result: 1
Result: -1
Result: 0

Example 2

import java.util.Scanner;
public class IntegerSignumExample2 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.print("Enter Positive Value: ");
		int a = sc.nextInt();
		int Result1 = Integer.signum(a);
		System.out.print("Result: "+Result1);	    
		System.out.print("\nEnter Negative Value: ");
		int b = sc.nextInt();
		int Result2 = Integer.signum(b);
		System.out.print("Result: "+Result2);		
		System.out.print("\nEnter Zero Value: ");
		int c = sc.nextInt();		
		int Result3 = Integer.signum(c);		
	      System.out.print("Result: "+Result3);
	      sc.close();
	}
}

Output:

Enter Positive Value: 4565
Result: 1
Enter Negative Value: -432
Result: -1
Enter Zero Value: 000
Result: 0

Example 3

public class IntegerSignumExample3 {
	public static void main(String[] args) {
	   double nan = Double.NaN;
        // Here argument is NaN, output will be NaN
        double result1 = Math.signum(nan);
        System.out.println("Output: "+result1);
        // Here argument is positive zero
        double result2 = Math.signum(0);
        System.out.println("Output: "+result2); 
        // Here argument is negative zero
        double result3 = Math.signum(-0);
        System.out.println("Output: "+result3);
	}
}

Output: