Refining Ch05.

projects/rectangles/src/main.rs

@@ -4,49 +4,14 @@ struct Rectangle {
     height: u32,
 }
 
-impl Rectangle {
-    fn area(&self) -> u32 {
-        self.width * self.height
-    }
-
-    fn width(&self) -> bool {
-        self.width > 0
-    }
-
-    fn can_hold(&self, other: &Rectangle) -> bool {
-        (self.width > other.width && self.height > other.height) ||
-            (self.width > other.height && self.height > other.width) 
-    } 
-
-    fn square(size: u32) -> Rectangle {
-        Rectangle {
-            width: size,
-            height: size,
-        }
-    }
-}
-
 fn main() {
+    let scale = 2;
+
     let rect1 = Rectangle {
-        width: 30, 
+        width: dbg! (30 * scale),
         height: 50,
     };
 
-    let rect2 = Rectangle {
-        width: 10, 
-        height: 40,
-    };
-
-    let rect3 = Rectangle {
-        width: 45, 
-        height: 25,
-    };
-
-    let sq1 = Rectangle::square(28);
-    let sq2 = Rectangle::square(35);
-
-    println! ("rect1 可以装下 rect2 吗？{}", rect1.can_hold(&rect2));
-    println! ("rect1 可以装下 rect3 吗？{}", rect1.can_hold(&rect3));
-    println! ("rect1 可以装下 sq1 吗？{}", rect1.can_hold(&sq1));
-    println! ("rect1 可以装下 sq2 吗？{}", rect1.can_hold(&sq2));
+    dbg! (&rect1);
 }
+