Programming Examples

Java program to check number is a prime and Automorphic or not


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.

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.

Solution

import java.util.*;
class MENU
{
	public static void main(String arr[])
	{
		Scanner sc=new Scanner(System.in);
		int ch,i,c=0,n;
		System.out.println("Enter a number:");
		n=sc.nextInt();
		System.out.println("MENU");
		System.out.println("1.Prime Number");
		System.out.println("2.Automorphic Number");
		System.out.println("Enter your choice:");
		ch=sc.nextInt();
		switch(ch)
		{
			case 1:
				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:
				for(i=n;i>0;i=i/10)
				{
					c++;
				}
				if((n*n)%(int)Math.pow(10,c)==n)
					System.out.println("Automorphic Number");
				else
					System.out.println("Not an Automorphic Number");
			break;
			default:
				System.out.println("Invalid choice");
		}
	}	
}
Output

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