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Java Number Programs (ICSE Classes 9 / 10)

Write a menu driven program to accept a number from the user and check whether it is a Prime number or an Automorphic number.

(a) Prime number: (A number is said to be prime, if it is only divisible by 1 and itself)

Example: 3,5,7,11

(b) Automorphic number: (Automorphic number is the 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.

Java

Java Iterative Stmts

ICSE

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Answer

import java.util.Scanner;

public class KboatPrimeAutomorphic
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("1. Prime number");
        System.out.println("2. Automorphic number");
        System.out.print("Enter your choice: ");
        int choice = in.nextInt();
        System.out.print("Enter number: ");
        int num = in.nextInt();

        switch (choice) {
            case 1:
            int c = 0;
            for (int i = 1; i <= num; i++) {
                if (num % i == 0) {
                    c++;
                }
            }
            if (c == 2) 
                System.out.println(num + " is Prime");
            else
                System.out.println(num + " is not Prime");
            break;

            case 2:
            int numCopy = num;
            int sq = num * num;
            int d = 0;

            /*
             * Count the number of 
             * digits in num
             */
            while(num > 0) {
                d++;
                num /= 10;
            }

            /*
             * Extract the last d digits
             * from square of num
             */
            int ld = (int)(sq % Math.pow(10, d));

            if (ld == numCopy)
                System.out.println(numCopy + " is automorphic");
            else
                System.out.println(numCopy + " is not automorphic");
            break;

            default:
            System.out.println("Incorrect Choice");
            break;
        }
    }
}

Output

BlueJ output of Write a menu driven program to accept a number from the user and check whether it is a Prime number or an Automorphic number. (a) Prime number: (A number is said to be prime, if it is only divisible by 1 and itself) Example: 3,5,7,11 (b) Automorphic number: (Automorphic number is the 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.BlueJ output of Write a menu driven program to accept a number from the user and check whether it is a Prime number or an Automorphic number. (a) Prime number: (A number is said to be prime, if it is only divisible by 1 and itself) Example: 3,5,7,11 (b) Automorphic number: (Automorphic number is the 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.

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