67. Add Binary

1.需求
Given two binary strings, return their sum (also a binary string).

For example,
a = “11”
b = “1”
Return “100”.

2.代码

#include <iostream>#include <string>using namespace std;class Solution {public:    string addBinary(string a, string b) {        int c = 0;        int i = a.length() - 1;        int j = b.length() - 1;        string result = "";        while(i >= 0 || j >= 0 || c == 1){            c += i >= 0 ? a[i--]-'0':0;            c += j >= 0 ? b[j--]-'0':0;            result= (char)(c % 2 + '0') + result;            c /= 2;        }        return result;    }};int main(){    Solution s;    cout << s.addBinary("11","1110") << endl;}

参考资料：
http://blog.csdn.net/wangyaninglm/article/details/46766027