---
description: Today 1 leet , tomorrow 頂天leet地
image: https://leetcode.com/static/images/LeetCode_Sharing.png
---
# To Lower Case
[題目網址<i class="fa fa-link"></i>](https://leetcode.com/problems/to-lower-case/)
## 題目敘述
Given a string `s`, return the string after replacing every uppercase letter with the same lowercase letter.
:::spoiler **Example 1**

> **Input:** "Hello"
> **Output:** "hello"
:::

:::spoiler **Example 2**
> **Input:** "here"
> **Output:** "here"
:::

## 解題思維
將所有**大寫字母**改成小寫

## 程式碼

class Solution {
public:
    string toLowerCase(string s) {
        for(int i=0;i<s.size();i++)
        {
            if(s[i]>='A'&&s[i]<='Z')
            {
                s[i]+=32;
            }
        }
        return s;
    }
};

$O(n)$
###### tags: `LeetCode` `String`