63 lines
911 B
Go
63 lines
911 B
Go
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package main
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import (
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"fmt"
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"math"
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)
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type Circle struct {
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Radius float64
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}
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func (c Circle) Area() float64 {
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return math.Pi * math.Pow(c.Radius, 2)
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}
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func (c Circle) String() string {
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return fmt.Sprintf("Circle {Radius: %.2f}", c.Radius)
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}
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type Square struct {
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Width float64
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Height float64
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}
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func (s Square) Area() float64 {
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return s.Width * s.Height
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}
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func (s Square) String() string {
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return fmt.Sprintf("Square {Width: %.2f, Height: %.2f}", s.Width, s.Height)
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}
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type Sizer interface {
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Area() float64
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}
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type Shaper interface {
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Sizer
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fmt.Stringer
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}
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func main() {
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c := Circle{Radius: 10}
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PrintArea(c)
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s := Square{Height: 10, Width: 5}
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PrintArea(s)
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l := Less(c, s)
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fmt.Printf("%v is the smallest\n", l)
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}
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func Less(s1, s2 Sizer) Sizer {
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if s1.Area() < s2.Area() {
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return s1
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}
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return s2
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}
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func PrintArea(s Shaper) {
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fmt.Printf("area of %s is %.2f\n", s.String(), s.Area())
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}
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