Created
May 7, 2017 19:36
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geometry interface & implementations
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package main | |
import ( | |
"fmt" | |
"math" | |
) | |
type geometry interface { | |
area() float64 | |
perim() float64 | |
resize(float64) | |
} | |
type rect struct { | |
width, height float64 | |
} | |
type circle struct { | |
radius float64 | |
} | |
type square struct { | |
width float64 | |
} | |
func (r rect) area() float64 { | |
return r.width * r.height | |
} | |
func (r rect) perim() float64 { | |
return 2*r.width + 2*r.height | |
} | |
func (r *rect) resize(value float64) { | |
r.width += value | |
r.height += value | |
} | |
func (c circle) area() float64 { | |
return math.Pi * c.radius * c.radius | |
} | |
func (c circle) perim() float64 { | |
return 2 * math.Pi * c.radius | |
} | |
func (c *circle) resize(value float64) { | |
c.radius += value | |
} | |
func (s square) area() float64 { | |
return s.width * s.width | |
} | |
func (s square) perim() float64 { | |
return 4 * s.width | |
} | |
func (s *square) resize(value float64) { | |
s.width += value | |
} | |
func measure(g geometry) { | |
fmt.Println(g) | |
fmt.Println(g.area()) | |
fmt.Println(g.perim()) | |
} | |
func main() { | |
r := &rect{width: 10, height: 4} | |
c := &circle{radius: 9} | |
s := &square{width: 10} | |
measure(r) | |
r.resize(4) | |
measure(r) | |
measure(c) | |
c.resize(10) | |
measure(c) | |
measure(s) | |
s.resize(-1) | |
measure(s) | |
} |
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