代码语言：javascript
复制package main
import (
"fmt"
"math"
)
type IRE struct {
Radius float64
MinRadius float64
MaxRadius float64
}
func newIRE(radius float64) *IRE {
ire := new(IRE)
ire.MinRadius = 5
ire.MaxRadius =50
ire.Radius = radius
return ire
}
func (ire *IRE) Error () string {
info := fmt.Sprintf("%f是非法半径，合法半径的范围是[%f,%f]n", ire.Radius, ire.MinRadius, ire.MaxRadius)
return info
}
func GetToyBallVolumn3(radius float64) (volumn float64,err error) {
//什么时候恐慌
if radius<0{
//panic(&IRE{0.5,5,50})
panic(newIRE(radius))
return
}
if radius<5||radius>50{
err = newIRE(radius)
//err = &IRE{0.5,5,50}
}
return (4.0/3.0) * math.Pi * math.Pow(radius,3),err
}
func main() {
defer func() {
//从恐慌中复活，找到导致恐慌的原因
if err:=recover();err!=nil{
fmt.Println(err)
}
}()
volumn3,err:= GetToyBallVolumn3(-2)
if err!=nil{
fmt.Println(err)
return
}
fmt.Println(volumn3)
}
