寫一個函式，求兩個整數之和，要求在函式體內不得使用+、-、*、/四則運算子號。

方法一:位運算

class Solution {
public:
    int Add(int num1, int num2)
    {
        /*
         if(num2 == 0) return num1;
         int sum = num1 ^ num2;
         int carry = (num1 & num2) << 1;
         return Add(sum, carry);
         */
        int sum = num1 ^ num2;
        int carry = (num1 & num2) << 1;  
        while(carry != 0){
        int a = sum;
        int b = carry;
        sum = a ^ b;
        carry = (a & b) << 1;  
         
       }
        return sum;
    }
};
 

方法二:構造方法

class Solution
{
public:
	Solution()
	{
		sum = -~sum;
		//sum ++;
	}
	static void Reset()
	{
		sum = 0;
	}
	static  int GetSum()
	{
		return sum;
	}
private:
	static int sum;
}; 
int Solution::sum = 0; 
int sum_solution(int n,int m)
{
	
	Solution::Reset();
	Solution *s = new Solution[n];
	Solution *s1 = new Solution[m];
	delete []s;
	delete[]s1;
	return Solution::GetSum();
}