HelloWorld

fn main() {print!("Hello,Wolrd")
}

斐波那契数列

fn fib(n: u64) -> u64 {let mut a = 0;let mut b = 1;for _ in 0..n {let c = a + b;a = b;b = c;}a
}fn main() {let n = 10;let result_list: Vec<String> = (1..n+1).map(|i| fib(i).to_string()).collect();let result = result_list.join(",");println!("{}", result);
}

计算表达式（加减乘除）

use std::io;
use std::num::ParseIntError;
fn parse_expression(expression: &str) -> Result<i32, ParseIntError> {let mut result = 0;let mut current_number = 0;let mut operator = '+';for token in expression.split_whitespace() {match token {"+" => operator = '+',"-" => operator = '-',"*" => operator = '*',"/" => operator = '/',_ => {current_number = match token.parse::<i32>() {Ok(num) => num,Err(e) => return Err(e),};match operator {'+' => result += current_number,'-' => result -= current_number,'*' => result *= current_number,'/' => result /= current_number,_ => {},}}}}Ok(result)
}
fn main() {println!("请输入表达式（例如：1 + 2 * 3）：");let mut input = String::new();io::stdin().read_line(&mut input).expect("读取输入失败");let expression = input.trim();match parse_expression(expression) {Ok(result) => println!("计算结果为：{}", result),Err(e) => println!("解析表达式时出错：{}", e),}
}