Closure of go (cumulative sum)

  problem ： from 1 To 10 Accumulate and output ： It is achieved through free variables .

Such as code ：sum It's a free variable

func add() func(int) int{
	sum := 0
	return func(i int) int{
		sum += i
		return sum
	}
}


func main() {

	a := add()
	for i:=0;i<10;i++{
		fmt.Printf("0+.......+%d: %d\n",i,a(i))
	}



}