用Golang实现图形面积计算

计算正方形面积

package mainimport "fmt"type square struct {side float32
}func (s square) area() float32 {return s.side * s.side
}func main() {s := square{side: 10}fmt.Printf("%T\n", s)fmt.Println(s.area())
}

计算正方形、圆形、矩形面积，写一个通用的函数info和一个通用的interface

package mainimport "fmt"
import "math"type square struct {side float32
}func (s square) area() float32 {return s.side * s.side
}type circle struct {radius float32
}func (c circle) area() float32 {return math.Pi * c.radius * c.radius
}type rectangle struct {width  float32length float32
}func (r rectangle) area() float32 {return r.width * r.length
}type shape interface {area() float32
}func info(sp shape) {fmt.Println("shape area : ", sp.area())
}func main() {s := square{side: 10}c := circle{radius: 10}r := rectangle{width: 10, length: 10}info(s) // 打印 shape area :  100info(c) // 打印 shape area :  314.15927info(r) // 打印 shape area :  100
}