以下代码简单介绍了 Rust 的基础数据类型

fn main() {
    // bool
    let is_true: bool = true;
    println!("is_true = {}", is_true);

    let is_false = false;
    println!("is_false = {}", is_false);

    // char 在 Rust 里面，char 是 32 位的
    let a = 'a';
    println!("a = {}", a);

    let b = '你';
    println!("b = {}", b);

    // i8, i16, i32, i64, u8, u16, u32, u64, f32, f64
    let c: i8 = -111;
    println!("c = {}", c);

    let d: f32 = 0.0009;
    println!("d = {}", d);

    // 自适应类型 isize, usize
    println!("max = {}", usize::max_value());
    println!("Hello, world!");

    // 数组
    // [Type: size], size 也是数组类型的一部分
    let arr: [u32; 3] = [1, 2, 3];
    println!("arr[0] = {}", arr[0]);

    show(arr);

    // 元组
    let tup: (i32, f32, char) = (-3, 3.69, '好');
    println!("---------------------");
    println!("{}", tup.0);
    println!("{}", tup.1);
    println!("{}", tup.2);
    println!("---------------------");

    let (x, y, z) = tup;
    println!("{}", x);
    println!("{}", y);
    println!("{}", z);
}

fn show(arr:[u32; 3]) {
    println!("---------------------");
    for i in &arr {
        println!("{}", i);
    }
    println!("---------------------");
}

输入 cargo run，输出如下

is_true = true
is_false = false
a = a
b = 你
c = -111
d = 0.0009
max = 18446744073709551615
Hello, world!
arr[0] = 1
---------------------
1
2
3
---------------------
---------------------
-3
3.69
好
---------------------
-3
3.69
好