Go语言递归实现的斐波纳契(Fibonacci)算法
package main
// fib returns a function that returns
// successive Fibonacci numbers.
func fib() func() int {
	a, b := 0, 1
	return func() int {
		a, b = b, a+b
		return b
	}
}
func main() {
	f := fib()
	// Function calls are evaluated left-to-right.
	println(f(), f(), f(), f(), f())
}




