Tech Number

 ✹ A Tech Number has an even number of digits. If the number is split into two equal halves. then the square of the sum of these halves is equal to the number itself.

For Example:  Input                  : 2025

Total Digits       : 4

1st Half              : 20

2nd Half            : 25

Sum                    : 20 + 25 = 45

Square              : 45 X 45 = 2025

Output              : It is a Tech Number

Few Example of Tech Numbers are : 81, 2025, 3025, 9801, 494209, 998001

import java.util.Scanner;
public class Tech_Number
{
    public static void main(String args[] )
    {
        int n,num,ld,rd,c=0,sq=0;
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter number=");
        n = sc.nextInt();
        num = n; //Copy the value of n in num variable
        //Count the Number of Digit
        while(num>0)
        {
            c++;
            num=num/10;
        }
        if(c%2==0) //Check the Number of Digits are Even or Odd
        {
            rd=n%(int)Math.pow(10,c/2); //Store the Right Half of the Number
            ld=n/(int)Math.pow(10,c/2); //Store the Left Half of the Number
            sq =(int)Math.pow((ld+rd),2); //Square after adding Left & Right Half of the Digit
            if (n == sq) //checking Tech Number
                System.out.println("Tech Number");
            else
                System.out.println("Not a Tech Number");
        }
        else
            System.out.println("Not a Tech Number");
    }
}