# Automorphic number or not using Java

## Automorphic number or not using Java :

Automorphic number is a number whose square ends in the same digits as the number itself.

For better understanding lets consider an example :

• Suppose a number 5.
• Square of 5 is 25.
• and we see that 25 ends in the same digit as the number itself, means 5.

Hence we can conclude that 5 is an Automorphic Number.

Some more Automorphic Numbers are : 5 , 6 , 76 , 376 and 890625. ### Working :

Step 1 : Ask the user to enter a number and store it in an integer variable.

Step 2 : Convert the integer value to String to perform string operations.

Step 3 : Calculate length of the number stored in String variable.

Step 4 : Calculate square of the number and store its value in an another integer variable.

Step 5 : Convert the square value in String variable and then calculate its length.

Step 6 : Make a substring from l2 – l1, where l2 is the length of square value and l1 is the length of the number entered by the user and store it in a variable.

Step 7 : Compare that whether the original number is equal to the substring value or not.

• If this gets true , then the given number is an Automorphic Number.
• Else the number is not an Automorphic Number.

### Code in Java :

`//Java program to check whether a number is Automorphic number or notimport java.util.Scanner;public class automorphic_number_or_not{		public static void main(String[] args)	{		//scanner class declaration		Scanner sc = new Scanner(System.in);		//input from user		System.out.print("Enter a number : ");						int number = sc.nextInt();                //Convert the number to string		String s1 = Integer.toString(number);                //Calculate the length		int l1 = s1.length();		int sq = number * number;		String s2 = Integer.toString(sq);		int l2 = s2.length();                //Create Substring		String s3 = s2.substring(l2-l1);		if(s1.equals(s3))			System.out.println("Automorphic Number");		else			System.out.println("Not an Automorphic Number");		//closing scanner class(not compulsory, but good practice)		sc.close();														}}`

### Output :

`Enter a number : 5Automorphic NumberEnter a number : 34Not an Automorphic Number`