Java Program to Check Tech Number

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In the previous article, we have discussed Java Program to Check Sunny Number

In this article we are going to understand what Tech number is and how we can check whether a number is Tech number or not in Java with examples.

Program to Check Tech Number

Tech numbers are numbers having even number of digits and when the digits are divided into two halves, and the square of the sum of two halves is equal to the number itself.

Example :

2025: 20+25= 45, (45)2=2025 Tech number

10000: 100+000=100, (100)2=10000 Tech number

63: 6+3=9, (9)2 =81 Not a Tech number

In the above examples the numbers 2025 and 10000 are Tech numbers as the square of their halves add upto the numbers. However 63 is not a Tech number.

Let’s see different ways to check Tech number.

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Approach :

  1. Enter/Declare a number and store it.
  2. We check whether the number has even digits, if not it can’t be a tech number.
  3. We break the number into two halves and add them. Then the sum is squared.
  4. If the squared number is equal to the entered number, then the number is said to be a Tech number.

Method-1: Java Program to Check Tech Number By Using Static Value

import java.util.Scanner;

public class TechNumber
{
    public static void main(String args[])
    {
        //A number declared
        int num = 2025;
        
        //numberOfDig() method called to get the number of digits in the number
        int digits = numberOfDig(num);

        //Checks whether the number has even number of digts
        // and whether the square of the sum of its halves are equal to the number itself
        if((digits%2==0) && (Math.pow((sumofHalves(num,digits)),2)==num))
        {
            System.out.println(num+" is a Tech Number");
        }
        else
        {
            System.out.println(num+" is Not a Tech Number");
        }
    }

    //Function that returns the sum of halves
    static int sumofHalves(int num,int digits)
    {
        int firstHalf = 0, secondHalf=0;
        firstHalf = num%(int)Math.pow(10,digits/2);
        secondHalf = num/(int)Math.pow(10,digits/2);
        return (firstHalf+secondHalf);
    }

    //method that returns the number of digits
    static int numberOfDig(int num)
    {
        int digits = 0;
        while (num > 0)
        {
            digits++;
            num = num / 10;
        }
        return digits;
    }

}

Output:

2025 is a Tech Number

Method-2: Java Program to Check Tech Number By User Input Value

import java.util.Scanner;

public class TechNumber
{
    public static void main(String args[])
    {
        //Taking the number as input from the user using scanner class
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter a number : ");
        int num = scan.nextInt();

        //numberOfDig() method called to get the number of digits in the number
        int digits = numberOfDig(num);

        //Checks whether the number has even number of digts
        // and whether the square of the sum of its halves are equal to the number itself
        if((digits%2==0) && (Math.pow((sumofHalves(num,digits)),2)==num))
        {
            System.out.println(num+" is a Tech Number");
        }
        else
        {
            System.out.println(num+" is Not a Tech Number");
        }
    }

    //Function that returns the sum of halves
    static int sumofHalves(int num,int digits)
    {
        int firstHalf = 0, secondHalf=0;
        firstHalf = num%(int)Math.pow(10,digits/2);
        secondHalf = num/(int)Math.pow(10,digits/2);
        return (firstHalf+secondHalf);
    }

    //Function that returns the number of digits
    static int numberOfDig(int num)
    {
        int digits = 0;
        while (num > 0)
        {
            digits++;
            num = num / 10;
        }
        return digits;
    }

}

Output:

Case-1

Enter a number : 2025
2025 is a Tech Number

Case-2

Enter a number : 202
202 is a Tech Number

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