23. Write a program to accept a number and check and display whether it is a spy number or not. (A number is called a spy number if the sum of its digits equals the product of the digits.)
Example:
Consider the number 1124.
Sum of the digits = 1 + 1 + 2 + 4 = 8.
Product of the digits = 1 * 1 * 2 * 4 = 8.

Program Title: Check Spy Number

Java

import java.util.Scanner;
 
public class SpyNumber {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
 
        System.out.print("Enter a number: ");
        int num = sc.nextInt();
        int temp = num;
 
        int sum = 0;
        int product = 1;
 
        while (temp != 0) {
            int digit = temp % 10;
            sum += digit;
            product *= digit;
            temp /= 10;
        }
 
        System.out.println("Sum of digits: " + sum);
        System.out.println("Product of digits: " + product);
 
        if (sum == product) {
            System.out.println(num + " is a Spy Number.");
        } else {
            System.out.println(num + " is NOT a Spy Number.");
        }
 
        sc.close();
    }
}

Output

Sample Input / Output 1: 
Enter a number: 1124
Sum of digits: 8
Product of digits: 8
1124 is a Spy Number.

Sample Input / Output 2: 
Enter a number: 123
Sum of digits: 6
Product of digits: 6
123 is a Spy Number.

📝 Explanation

Spy Number Definition: A number where
Sum of digits = Product of digits
Extract digits using % 10
Add to sum and multiply to product
Compare sum and product to determine if it’s a Spy Number