709. To Lower Case*
https://leetcode.com/problems/to-lower-case/
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"
C++ 实现 1
查询 ASCII 码表, 发现 A ~ Z 的码为 65 ~ 90, 而 a~z 的码为 97~122.
class Solution {
public:
string toLowerCase(string str) {
for (auto &c : str)
if (c >= 65 && c <= 90)
c += 32;
return str;
}
};