Question

Please koi answers send kar do please ​

Answer 1

Answer:

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.

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)