scalar.md

标量变量类型

布尔类型

fn main() {
    let x = true;
    let y:bool = false;
    println!("x is {}", x);
    println!("y is {}", y);
}

整数类型，默认是i32

fn main() {
    let x = 32;
    let y:u32 = 10000;
    let z = x*y;
    println!("x is {}", x);
    println!("y is {}", y);
    println!("z is {}", z);
}

浮点数类型，默认会使用f64

fn main() {
    let x:f64 = 2.0;
    let y:f64 = 3.5;
    let z = x*y;
    println!("x is {}", x);
    println!("y is {}", y);
    println!("z is {}", z);
}

注意：整数和浮点数不能直接相乘，因为它们的数据类型不同。

字符类型

fn main() {
    let x = 'a';
    println!("x is {}", x);
}