c_cpp ＃709转换成小写字母

Posted 2021-05-14

class Solution {
public:
    string toLowerCase(string str) {
        string r_str = str;
        for(int i = 0;i < str.length();++i){
            if((str[i] >= 65)&&(str[i] <= 90))
                r_str[i] = str[i] + 32;
        }
        return r_str;
    }
};