("test sub num: {:?}", num), } } } 输出: ➜ learn-clap git:(master) ✗ ./target/release/examples/subcommand --help this is the about from Cargo.toml Usage: subcommand [COMMAND] Commands: add Add a number sub Sub a number help Print this message or the help of the given ...
#[test]fntest_addition(){assert_eq!(2+2,4);}#[test]fntest_subtraction(){assert!(5-3>0);} 运行测试。可以使用Rust的测试运行器工具来执行测试。常见的测试命令是cargo test,它会自动查找和运行项目中的所有测试函数。在「项目根目录下」运行以下命令: 代码语言:javascript 复制 cargo test 测试运行结果...
print!() 两个的区别仅在于是否在末尾加上换行符。 2.2 占位符 上面的例子中,在输出参数中存在一个占位符 {},用来指代后面参数列表中的参数: 代码语言:javascript 复制 println!("a is {}, a again is {}",a,a); 在这个例子中,参数列表中的 a 出现了两次,看起来有些冗余,rust 允许在 {} 中加入数...
(". "), 0xff => print!("## "), _ => print!("{:02x} ", byte), } } println!(""); pos += BYTES_PER_SIZE; } } //逐行获取 fn show_string(path: &str) { let f = File::open(path).expect("打开文件失败"); let buf = io::BufReader::new(f); for line in buf....
fn test(s1:String){print!("{}",s1);}fn main() {let s = String::from("hello");test(s);//传参,所有权发生了转移print!("{}",s);//此处s无效,编译报错} 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. ...
(); // <3> let re = Regex::new(pattern).unwrap(); if let Some(test) = args.value_of("test") { // <4> println!("test: {:?}", test); } let quote = "Every face, every shop, bedroom window, public-house, and dark square is a picture feverishly turned--in search of ...
--target triple为给定的体系结构构建。默认为主机架构。三元组的一般格式是<arch>-<vendor>-<sys>-<abi>。 运行rustc --print target-list以获取受支持目标的列表。可以多次指定该标志。 这也可以用build.target配置值https://doc.rust-lang.org/cargo/reference/config.html来指定。 注意,指定...
("{0}, in binary: {0:b}, in hexadecimal: {0:x}", 11);// debug trait (very useful to print anything)// if you try to print the array directly, you will get an error// because an array is not a string or number typeprintln!("{:?}", [11, 22, 33]);...
to test all included Rust snippets. Run mdbook serve to start a web server with the course. You'll find the content onhttp://localhost:3000. You can usemdbook buildto create a static version of the course in thebook/directory. Note that you have to separately build and zip exercises and...
print(); } 1. 2. 3. 4. 5. 6. 2.1.2. 通过可变引用 接着我们看一下通过可变引用捕获变量: #[test] fn function_test() { let mut count = 0; let mut inc = || { count += 1; println!("`count`: {}", count); }; inc(); ...