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| package main
import ( "fmt" "math" )
//匿名函数 func main(){ //无参匿名函数 func(){ fmt.Println("jonson") }()
//有参匿名函数 func(data int){ fmt.Println("data:",data) }(5)
//有返回值的匿名函数 result:=func(data float64) float64{ return math.Sqrt(data) }(9)
fmt.Println("result:",result)
greet:=func(){ fmt.Println("greet jonson") } greet()
fmt.Printf("greet的类型是%T\n",greet)
//闭包 greetjonson()
//函数作为返回值
makejonson := makeGreeter()
fmt.Printf("类型:%T,返回值:%v\n",makejonson,makejonson())
//闭包做为返回值 makeeven := makeEvenGenerator()
fmt.Println("makeeven i = ",makeeven()) fmt.Println("makeeven i = ",makeeven()) fmt.Println("makeeven i = ",makeeven())
//callback函数作为参数 visit([]int{1,2,3,4},func(n int){ fmt.Println(n+1) })
//死循环 fmt.Println(factorial(5))
var i uint = 0 for ;i<20;i++{
fmt.Println(fabicc(i))
} }
//闭包
func greetjonson(){ x:=0
increment:= func() int{ x++ return x }
fmt.Println(increment()) fmt.Println(increment()) } //函数作为返回值
func makeGreeter() func() string{
return func() string { return "hello jonson" } }
//闭包与函数返回值
func makeEvenGenerator() func() int{ i:=0 return func() int{ i+=2 return i } }
//callback函数作为参数
func visit(numbers []int,callback func(int)){
for _,n :=range numbers{ callback(n) } }
//递归
// 计算阶乘 5 5*4*3*2*1
func factorial(x uint) uint{
if x==0{ return 1 } return x * factorial(x-1) }
//fabicc
func fabicc(x uint) uint{
if(x==0){ return 0 } if(x==1){ return 1 }
return fabicc(x-2) + fabicc(x-1) }
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