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package Maths;

/*
 * Algorithm explanation: https://technotip.com/6774/c-program-to-find-generic-root-of-a-number/#:~:text=Generic%20Root%3A%20of%20a%20number,get%20a%20single%2Ddigit%20output.&text=For%20Example%3A%20If%20user%20input,%2B%204%20%2B%205%20%3D%2015.
 */
public class GenericRoot {
	public static void main(String[] args) {
		int number1 = 1234;
		int number2 = 12345;
		int result1 = genericRoot(number1);
		int result2 = genericRoot(number2);
		System.out.println("Generic root of " + number1 + " is: " + result1);
		System.out.println("Generic root of " + number2 + " is: " + result2);
	}

	private static int genericRoot(int n) {
		int root = 0;
		while (n > 0 || root > 9) {
			if (n == 0) {
				n = root;
				root = 0;
			}
			root += n % 10;
			n /= 10;
		}
		return root;
	}
}

GenericRoot

A