problem

​​709. To Lower Case​​

solution1:

class Solution {
public:
    string toLowerCase(string str) {
        string res = "";
        for(auto ch:str)
        {
            if(ch>='A'&&ch<='Z') ch +=32;
            res += ch;
        }
        return res;
    }
};

solution2:

class Solution {
public:
    string toLowerCase(string str) {
        for(auto &ch:str)
        {
            if(ch>='A'&&ch<='Z') ch +=32;
        }
        return str;
    }
};

参考

1. ​​Leetcode_easy_709. To Lower Case​​;

2. ​​Grandyang​​;

完