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.

Automorphic number or not using java

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 not
import 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 : 5
Automorphic Number

Enter a number : 34
Not an Automorphic Number

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