package main

// exercise link: https://go.dev/tour/moretypes/26

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
	first := 0
	second := 1
	return func() int {
		second += first
		first = second - first
		return first
	}
}

func main() {
	f := fibonacci()
	for i := 0; i < 10; i++ {
		fmt.Println(f())
	}
}