go接口

package main
impoet (
"fmt"
)

type Employer interface {
    CalcSalary() float32
}

type Programer struct {
    name string
    base float32
    extra float32
}
func NewProgramer(name string,base float32,extra float32) Programer{
  return Programer{
      name:name,
      base:base,
      extra:extra,
  }
}
func (p Programer) CalcSalary() float32 {
    return  p.base

}
type Sale struct {
    name string
    base float32
    extra float32
}

func  NewSale(name string,base,extra float32) Sale {
    return  Sale{
        name:name,
        base:base,
        extra:extra,
    }

}
func (p Sale)  CalcSalary() float32 {
    return  p.base+p.extra*p.base*0.5

}

func calcAll(e []Employer) float32  {
    var cost float32
    for _,v:=range e{
        cost=cost+v.CalcSalary()
    }
    return  cost

}
func main()  {
    p1 :=NewProgramer("搬砖1",1500.0,0)
    p2 :=NewProgramer("搬砖1",1500.0,0)
    p3 :=NewProgramer("搬砖1",1500.0,0)

    s1 :=NewSale("销售1",800.0,2.5)
    s2 :=NewSale("销售2",800.0,2.5)
    s3 :=NewSale("销售3",800.0,2.5)
    var employlist []Employer
    employlist=append(employlist,p1)
    employlist=append(employlist,p2)
    employlist=append(employlist,p3)
    employlist=append(employlist,s1)
    employlist=append(employlist,s2)
    employlist=append(employlist,s3)
    cost :=calcAll(employlist)
    fmt.Printf("这个月的总成本:%f\n",cost)
}