Write a menu-driven program to accept a number and check whether it is a prime number or an automorphic number. Use a switch-case statement.

Java Programming Language (Article) (Program)

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Write a menu-driven program to accept a number and check whether it is a prime number or an automorphic number. Use a switch-case statement.

(a) Prime Number: A number is said to be a prime number if it is divisible only by 1 and itself and not by any other number.
Example: 3, 5, 7, 11, 13, etc.

(b) Automorphic Number: An automorphic number is a number which is contained in the last digit(s) of its square.
Example: 25 is an automorphic number as its square is 625 and 25 is present as the last two digits.

Program:

import java.io.*;

class Menu {
    int ch, n, i, c = 0, flag = 0, s;

    void check() throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        
        // Display menu options
        System.out.println("1. Prime");
        System.out.println("2. Automorphic");
        System.out.println("Enter Your Choice:");
        ch = Integer.parseInt(br.readLine());
        
        // Read the number
        System.out.println("Enter a Number:");
        n = Integer.parseInt(br.readLine());
        
        // Perform actions based on user choice
        switch (ch) {
            case 1:
                // Check for prime number
                c = 0; // Reset counter
                for (i = 1; i <= n; i++) {
                    if (n % i == 0) {
                        c++;
                    }
                }
                if (c == 2) {
                    System.out.println("Prime number.");
                } else {
                    System.out.println("Not a Prime number.");
                }
                break;
                
            case 2:
                // Check for automorphic number
                s = n * n;
                int tempN = n;
                int tempS = s;
                
                // Determine the number of digits in the original number
                while (tempN > 0) {
                    tempN = tempN / 10;
                    flag++;
                }
                
                // Check if the last digits of the square match the original number
                int divisor = (int) Math.pow(10, flag);
                if (s % divisor == n) {
                    System.out.println("Automorphic number.");
                } else {
                    System.out.println("Not an Automorphic number.");
                }
                break;
                
            default:
                System.out.println("Invalid Choice.");
                break;
        }
    }

    // Main method to execute the program
    public static void main(String[] args) throws IOException {
        Menu menu = new Menu();
        menu.check();
    }
}

Output:

Explanation:

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