Java program to verify a Tech Number

README.md

Tech Number

Definition

• Postive integer with even number of digits
• Can be split into halves
• the square of the sum of the 2 halves must be equal to the original integer
• example: 2025 -> 20, 25 -> 20+25=45 -> (45)² = 2025

Author

@dampdigits

TechNumber.java

class TechNumber {
	public static void main(String args[]) {
		for (int i = 0; i < args.length; i++)
			if (isTechNumber(Integer.parseInt(args[i])))
        System.out.println(i + " is a Tech Number");
	}
	static boolean isTechNumber(int num) {
		String str = Integer.toString(num);

		// Check for even number of digits
		if (str.length()%2 != 0)
			return false;
		
		// Split into 2 numbers
		String str1 str.substring(0, str.length() / 2);
		String str2 str.substring(str.length() / 2);
		
		// Find square of sum of Split numbers
		int square = (int) Math.pow(Integer.parseInt(str1) + Integer.parseInt(str2), 2);
		if (square == num)
			return true;
		return false;
	}
}