> For the complete documentation index, see [llms.txt](https://ryukiedev.gitbook.io/wiki/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ryukiedev.gitbook.io/wiki/shu-ju-jie-gou-yu-suan-fa/jian-zhi-offerswift/05.-ti-huan-kong-ge.md).

# 05.替换空格

### 一、 题目

请实现一个函数，把字符串 s 中的每个空格替换成"%20"。

示例 1：

输入：s = "We are happy."

输出："We%20are%20happy."

限制：

0 <= s 的长度 <= 10000

链接：<https://leetcode-cn.com/problems/ti-huan-kong-ge-lcof>

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### 二、 解法

```
func replaceSpace(_ s: String) -> String {    
    var temp = ""
    for c in s {
        if String(c) == " " {
            temp += "%20"
        }
        else {
            temp += String(c)
        }
    }
    return temp
}
```