Question

Write a menu driven program to accept a number and check and display whether it is a Prime Number or not OR an Automorphic Number or not. (Use 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 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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Code

				
					import java.util.Scanner;
public class Program7
{
    public static void main(String[]args)
    {
	    int choice,n,i=0,count=0;
	    Scanner sc = new Scanner(System.in);
        System.out.println("Enter 1 for Prime number");
        System.out.println("Enter 2 for Automorphic number");
        System.out.print("Enter your choice: ");
        choice = sc.nextInt();
	
	    switch(choice)
	    {
	       case 1:
	            System.out.print("Enter a no. ");
	            n = sc.nextInt();
		        
		        for(i=1;i<=n;i++)
		        {
			        if(n%i==0)
			        {
				        count++;
		            }
		        }
		        if(count == 2)
		        {
		            System.out.println(n+" is a Prime no.");
			    }
		        else
		        {
			        System.out.println(n+" is not a Prime no.");
		        }
		        break;
		    
		    
	       case 2:
	           System.out.print("Enter a no. ");
	            n = sc.nextInt();
		        int temp,rem;
		        temp = n;
		        /*counting digits in number 'n'*/
		        while(temp>0)    
		        {
	        	    temp/=10;
	        	    count++;
	    	    }
	    	    rem = (n*n) % (int)Math.pow(10,count);
	    	    if(rem==n)
	    	    {
	    		    System.out.println(n+" is an Automorphic no. ");
	    		}
	    	    else
	    	    {
	        	    System.out.println(n+ " is Not an Automorphic no. ");
		        }
		        break;
          default:
		        System.out.println("Invalid Choice");
	    }
    }
}