题解 | #不用加减乘除做加法#

class Solution {
  public:
    int Add(int num1, int num2) {
        int add = 0;
        if (num2 >= 0) {
            while (num2 > 0) {
                add++;
                num2--;
            }
            while (add > 0) {
                num1++;
                add--;
            }
        } else {
            while (num2 < 0) {
                add++;
                num2++;
            }
            while (add > 0) {
                num1--;
                add--;
            }
        }
        return num1;
    }
};