go语言渐入佳境[10]-function

func printstring(){
	fmt.Println("hello jonson")
}

func add(a,b int){
	fmt.Println("a+b=",a+b)
}

func addres(a,b int) int{
	return a+b
}

func addresname(a,b int)(sum int){
	sum = a+b
	return
}

func addmuti(a,b int)(int,int){
	add := a+b
	mul:= a*b

	return add,mul
}

func addsum(nums ... int) int{
	var sum int
	for _,value :=range nums{
		sum +=value
	}
	return sum
}

package main

import "fmt"

func main(){

	printstring()
	add(2,4)

	fmt.Println("addres 6+7 = ",addres(6,7))
	fmt.Println("addresname 3+4 = ",addresname(3,4))

	add,sum :=addmuti(5,6)
	fmt.Printf("addmuti 5+6=%d,5*6=%d\n",add,sum)


	ADDsum :=  addsum(1,2,3,4,5)
	fmt.Println("addsum = ",ADDsum)
}




//无参函数

func printstring(){
	fmt.Println("hello jonson")
}

//带参函数

	func add(a,b int){
		fmt.Println("a+b=",a+b)
	}

//返回值


func addres(a,b int) int{
	return a+b
}


// 有名字的返回值

func addresname(a,b int)(sum int){
	sum = a+b
	return
}


//多返回值

func addmuti(a,b int)(int,int){
	add := a+b
	mul:= a*b

	return add,mul
}



//不定个数参数


func addsum(nums ... int) int{
	var sum int
	for _,value :=range nums{
		sum +=value
	}
	return sum
}