题目：

Let's have some fun with functions.Implement a fibonacci function that returns a function (a closure) that returns successive fibonacci numbers (0, 1, 1, 2, 3, 5, ...).

代码：

package mainimport "fmt"// fibonacci is a function that returns// a function that returns an int.func fibonacci() func() int {	a, b, c := 0, 1, 0	return func () int {		c, a, b = a, b, a+b		return c	}}func main() {	f := fibonacci()	for i := 0; i < 10; i++ {		fmt.Println(f())	}}

运行结果：

0112358132134