Method add

java/Chapter 18/Question18_1/Question.java:5–10

(int a, int b)

public class Question {

	public static int add(int a, int b) {
		if (b == 0) return a;
		int sum = a ^ b; // add without carrying
		int carry = (a & b) << 1; // carry, but don�t add
		return add(sum, carry); // recurse
	}
	
	public static int randomInt(int n) {
		return (int) (Math.random() * n);