#[derive(Debug)]
struct Rectangle {
    name: String,
    width: u32,
    height: u32,
}

impl Rectangle {
    // 方法
    fn area(&self) -> u32 {
        self.width * self.height
    }
    // 更多参数的方法
    fn hold(&self, other: &Rectangle) -> bool {
        self.width > other.width && self.height > other.height
    }
    // 关联函数
    fn square(size: u32) -> Rectangle {
        Rectangle { name: String::from(""), width: size, height: size }
    }
}

let rectangle = Rectangle { name: String::from("R"), width: 10, height: 20 };
println!("{:?}", rectangle);
println!("The area of the rectangle {} is {}", rectangle.name, rectangle.area());

let rectangle1 = build_rectangle(String::from("R1"), 10, 20);
println!("{:?}", rectangle1);
println!("The area of the rectangle {} is {}", rectangle1.name, rectangle1.area());

fn build_rectangle(name: String, width: u32, h: u32) -> Rectangle {
    Rectangle {name,width,height:h}
}

let rectangle2 = Rectangle {name: String::from("R2"),..rectangle1};
println!("{:?}", rectangle2);
println!("The area of the rectangle {} is {}", rectangle2.name, rectangle2.area());

struct Color(i32, i32, i32);
let black = Color(0, 0, 0);

struct AlwaysEqual;
let subject = AlwaysEqual;