package main

import "fmt"

type BaseClass struct {
	x int
	y int
}
type AggClass struct {
}
type Rect struct {
	BaseClass
	Width  float64
	Height float64
	*AggClass
}

func (this *Rect) Area() float64 {
	return this.Width * this.Height
}
func main() {
	rc := &Rect{Width: 100, Height: 200}
	fmt.Println(rc)
}