https://github.com/sunny-117/30-seconds-of-rs
30 seconds to collect useful rust snippet.
https://github.com/sunny-117/30-seconds-of-rs
Last synced: 6 months ago
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30 seconds to collect useful rust snippet.
- Host: GitHub
- URL: https://github.com/sunny-117/30-seconds-of-rs
- Owner: Sunny-117
- License: mit
- Created: 2024-01-12T10:59:01.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2024-10-20T06:46:43.000Z (12 months ago)
- Last Synced: 2025-03-25T19:38:50.797Z (7 months ago)
- Language: Rust
- Size: 10.7 KB
- Stars: 2
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# 30-seconds-of-rs
30 seconds to collect useful rust snippet.
[](https://github.com/Sunny-117/30-seconds-of-rs/blob/master/LICENSE)
[](http://makeapullrequest.com)
[](https://github.com/Sunny-117)
> 你可以在 30 秒或更短时间内收集有用的 rust 代码片段。
- 使用 Ctrl + F 或者 command + F 来查找代码片段。
- 代码片段基于 Rust，如果你还不熟悉可以在[这里](https://course.rs/about-book.html)学习。
## 目录
### 📚 应用类
详细信息
- [`简易计算器`](#calc)
- [`文件读取器`](#fileReader)
### 📚 数学类
详细信息
- [`斐波那契`](#fibonacci)
### calc
输入表达式，格式如 1 + 2 或 3 \* 4，输入 'exit' 退出:
```rust
use std::io;
fn main() {
loop {
println!("请输入表达式，格式如 1 + 2 或 3 * 4，输入 'exit' 退出:");
let mut input = String::new();
io::stdin().read_line(&mut input).expect("读取输入失败");
// 去除首尾空格
let input = input.trim();
if input == "exit" {
println!("退出计算器");
break;
}
// 解析表达式
let tokens: Vec<&str> = input.split_whitespace().collect();
if tokens.len() != 3 {
println!("无效的表达式，请重新输入");
continue;
}
// 获取操作数和运算符
let operand1: f64 = match tokens[0].parse() {
Ok(num) => num,
Err(_) => {
println!("无效的数字: {}", tokens[0]);
continue;
}
};
let operator = tokens[1];
let operand2: f64 = match tokens[2].parse() {
Ok(num) => num,
Err(_) => {
println!("无效的数字: {}", tokens[2]);
continue;
}
};
// 执行计算
let result = match operator {
"+" => operand1 + operand2,
"-" => operand1 - operand2,
"*" => operand1 * operand2,
"/" => {
if operand2 != 0.0 {
operand1 / operand2
} else {
println!("除数不能为零");
continue;
}
}
_ => {
println!("无效的运算符: {}", operator);
continue;
}
};
// 输出结果
println!("结果: {}", result);
}
}
```
### fileReader
```rust
use std::fs;
fn main() -> Result<(), std::io::Error> {
let content = read_file("assets/demo.csv");
match content {
Ok(content) => println!("{}", content),
Err(e) => println!("Error: {}", e),
}
// 同上功能，语法糖写法：
let content = read_file("assets/demo.csv")?;
println!("{}", content);
Ok(())
}
fn read_file(file_path: &str) -> Result {
fs::read_to_string(file_path)
}
```
### fibonacci
```rust
use std::time::Instant;
fn fibonacci(n: u32) -> u32 {
if n <= 1 {
return n;
}
fibonacci(n - 1) + fibonacci(n - 2)
}
fn main() {
let n = 40;
let start_time = Instant::now();
let result = fibonacci(n);
let duration = start_time.elapsed();
println!("Fibonacci({}) = {}", n, result);
println!("耗时: {} 毫秒", duration.as_millis());
}
```
[⬆ 回到顶部](#目录)