結構體和方法

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use std::fmt;#[derive(Debug)] struct Rectangle {width: u32,height: u32, }impl std::fmt::Display for Rectangle {fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {write!(f, "Rectangle width: {} height: {}", self.width, self.height)} }impl Rectangle {fn area(&self) -> u32 {self.width * self.width}fn can_hold(&self, other: &Rectangle) -> bool {self.width > other.width && self.height > other.height}fn square(size: u32) -> Rectangle {Rectangle {width: size,height: size,}} }fn main() {let rect1 = Rectangle { width: 30, height: 50 };let rect2 = Rectangle { width: 10, height: 40 };let rect3 = Rectangle { width: 60, height: 45 };let rect4 = Rectangle::square(40);println!("Can rect1 hold rect2? {}", rect1.can_hold(&rect2));println!("Can rect1 hold rect3? {}", rect1.can_hold(&rect3));println!("rect4 is {}", rect4);println!("rect4 is {:#?}", rect4);println!("The area of the rectangle is {} square pixels.",rect4.area()); }

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轉載于:https://www.cnblogs.com/lsgxeva/p/8544200.html

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