题目描述：

Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase.

 

Example 1:

Input: "Hello"Output: "hello"

Example 2:

Input: "here"Output: "here"

Example 3:

Input: "LOVELY" Output: "lovely" 解题思路： 还是直接看代码。 代码：

1 char* toLowerCase(char* str) {2     for (int i = 0; str[i] != '\0'; ++i) {3         if (str[i] >= 'A' && str[i] <= 'Z') {4             str[i] = str[i] - ('A' - 'a');5         }6     }7     return str;8 }