47 lines
648 B
Go
47 lines
648 B
Go
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
)
|
|
|
|
type geometry interface {
|
|
area() float64
|
|
perim() float64
|
|
}
|
|
|
|
type rect struct {
|
|
width, height float64
|
|
}
|
|
type circle struct {
|
|
radius float64
|
|
}
|
|
|
|
func (r *rect) area() float64 {
|
|
return r.width * r.height
|
|
}
|
|
func (r *rect) perim() float64 {
|
|
return 2*r.width + 2*r.height
|
|
}
|
|
|
|
func (c *circle) area() float64 {
|
|
return math.Pi * c.radius * c.radius
|
|
}
|
|
func (c *circle) perim() float64 {
|
|
return 2 * math.Pi * c.radius
|
|
}
|
|
|
|
func measure(g geometry) {
|
|
fmt.Println(g)
|
|
fmt.Println(g.area())
|
|
fmt.Println(g.perim())
|
|
}
|
|
|
|
func main() {
|
|
r := &rect{width:3, height:4}
|
|
c := &circle{radius: 5}
|
|
|
|
measure(r)
|
|
measure(c)
|
|
}
|