In this section, we will explore the concept of tech numbers and develop a Java program to identify them.
What is a Tech Number?
A tech number is defined as a number that has an even number of digits and can be divided exactly into two equal parts from the middle. Once the number is divided equally, the two parts are summed, and the square of the sum is calculated. If the result is equal to the original number, then it is considered a tech number. For instance, 3025 is an example of a tech number.
Tech Number Example
Let’s take an example and check whether 2025 and 1312 are tech numbers or not.
Steps to Find Tech Number
To determine if a number is a tech number, the base condition is that it must have an even number of digits. If this condition is not met, the code will not proceed further. Here are the steps involved:
- Read or initialize the number (num).
- Calculate the number of digits in the given number (num).
- If the number of digits is not even, then the number (num) is not a tech number.
- Otherwise, split the given number into two equal parts (num1 and num2), ensuring that each part has an equal number of digits.
- Add the two numbers (num1 + num2) and store the result in a variable.
- Calculate the square of the sum and store it in a variable called “square”.
- Compare the original number (num) with the square of the sum. If they are equal, print “Tech Number”; otherwise, print “Not a Tech Number”.
Tech Number Java Program
TechNumberExample1.java
import java.util.Scanner;
public class TechNumberExample
{
public static void main(String args[])
{
int n, num, firstHalf, secondHalf, digits = 0, squareOfSum = 0;
Scanner sc = new Scanner(System.in);
System.out.print("Enter a number to check: ");
//reads an integer from the user
n = sc.nextInt();
//assign the value of n into num
num = n;
//the loop executes until the condition returns false
while (num > 0)
{
//incerements the variable digits by 1
digits++;
//removes the last digit of the given number
num = num / 10;
}
//check if the given number has an even number of digits or not
if (digits % 2 == 0)
{
num = n;
//determines the first half of the given number
firstHalf = num % (int) Math.pow(10, digits / 2);
//determines the second half of the given number
secondHalf = num / (int) Math.pow(10, digits / 2);
//calculate the square of both the numbers
squareOfSum = (firstHalf + secondHalf) * (firstHalf + secondHalf);
//compares the square of the sum with the given number
if (n == squareOfSum)
{
System.out.println(n+" is a tech number.");
}
else
{
System.out.println(n+" is not a tech number.");
}
}
else
{
System.out.println(n+ " is not a tech number.");
}
}
}
Output 1:
Enter a number to check: 2025 2025 is a tech Number.
Output 2:
Enter a number to check: 9181 9181 is not a tech number.
TechNumberExample2.java
public class TechNumberExample1
{
public static void main(String args[])
{
System.out.println("Tech numbers between 1 to 1000000 are: ");
for (int i = 1; i <= 1000000; i++)
{
//determines the last digit of the given number
int p1 = i % 100;
//removes the last digit of the number
int p2 = i / 100;
//add the two parts i.e. p1 and p2
int sum = p1 + p2;
//square the sum that we get from the above statement and compare the square with the given number
if (i == (sum * sum))
//prints the tech number
System.out.println(i);
}
}
}
Output:
Tech numbers between 1 to 1000000 are: 1 2025 3025 9801 10000
TechNumberExample3.java
import java.util.*;
public class TechNumberExample2
{
public static void main(String args[])
{
int count=0;
Scanner sc = new Scanner( System.in );
System.out.print("Enter the number to check: ");
//reads an integer from the user
int n=sc.nextInt();
//loop counts the number of digits of the given number
while(n>0)
{
count++;
n=n/10;
}
//check if the given number has even number of digits or not
if(count%2==0)
System.out.println("The given number is a tech number.");
else
System.out.print("The given number is not a tech number.");
}
}
Output:
Enter the number to check: 3025 The given number is a tech number.
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