GO语言练习：struct基础练习

1、代码

2、运行

---

1、代码

 package main

 import "fmt"

 type Rect struct {
     x, y float64
     width, height float64
 }

 func (r * Rect) Area() float64 {
     return r.width * r.height
 }

 func Init() {
     rect1 := new(Rect)
     rect2 := &Rect{}
     rect3 := &Rect{0, 0, 100, 200}
     rect4 := &Rect{width : 100, height : 200}

     ShowRect(rect1)
     ShowRect(rect2)
     ShowRect(rect3)
     ShowRect(rect4)
 }
 func NewRect(x, y, width, height float64) * Rect {
     return &Rect{x, y, width, height}
 }

 func ShowRect(rect * Rect) {
     fmt.Println(rect.x, rect.y, rect.width, rect.height)
 }

 func main() {
     Init()
     var rect *Rect = NewRect(1.0, 2.0, 3.0, 4.0)
     ShowRect(rect)
     fmt.Println("area = ", rect.Area())
 }

2、运行

$ go run struct.go
0 0 0 0
0 0 0 0
0 0 100 200
0 0 100 200
1 2 3 4
area =  12