Example: Check Number Sign with signum() method in Java

// Check Number Sign with signum() method
import java.util.Scanner;

// Main class containing the entry point of the program
public class Main {
    public static void main(String[] args) {
        // Step 1: Create a Scanner object
        Scanner scanner = new Scanner(System.in);

        // Step 2: Prompt and read the number (using int for Integer.signum())
        System.out.print("Enter an integer: ");
        int intNumber = scanner.nextInt();

        // Step 3: Get the sign using Integer.signum()
        int intSign = Integer.signum(intNumber);

        // Step 4: Print the result based on the sign
        if (intSign == 1) {
            System.out.println(intNumber + " is a positive number (using Integer.signum()).");
        } else if (intSign == -1) {
            System.out.println(intNumber + " is a negative number (using Integer.signum()).");
        } else {
            System.out.println(intNumber + " is zero (using Integer.signum()).");
        }

        // Step 5: Prompt and read a double (for Math.signum())
        System.out.print("Enter a floating-point number: ");
        double doubleNumber = scanner.nextDouble();

        // Step 6: Get the sign using Math.signum()
        double doubleSign = Math.signum(doubleNumber); // Returns 1.0, -1.0, or 0.0

        // Step 7: Print the result based on the sign
        if (doubleSign == 1.0) {
            System.out.println(doubleNumber + " is a positive number (using Math.signum()).");
        } else if (doubleSign == -1.0) {
            System.out.println(doubleNumber + " is a negative number (using Math.signum()).");
        } else {
            System.out.println(doubleNumber + " is zero (using Math.signum()).");
        }

        // Step 8: Close the scanner
        scanner.close();
    }
}