Divide Two Integers 没做出来需要重新看（（（（（重重重重））））））！！！！！！！！！！！！！

题目：

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别人的通过代码：

class Solution {public:int divide(int dividend, int divisor) {// Note: The Solution object is instantiated only once.long long a = abs((double)dividend);long long b = abs((double)divisor);long long res = 0;while (a >= b){long long c = b;for (int i = 0; a >= c; i++, c <<= 1)  //除数不断地*2  直到大于被除数{a -= c;  //减去除数res += 1 << i;  //除数*2多少次   结果就要增加多少次}}return ((dividend ^ divisor) >> 31) ? (-res) : (res);}};