这个程序的运行流程和5.8里面的那个倒计时有点相似。我们用3作为参数来调用一下这个阶乘函数试试。

The flow of execution for this program is similar to the flow of countdown in Section 5.8. If we call factorial with the value 3.

youdao

只需将三种最常用的时间编入程序，以后就再不用设置倒计时间了。

Program the three most frequently used times and never set countdown times again.

youdao

只需将三种最常用的时间编入程序，以后就再不用设置倒计时间了。

Program the three most frequently used times and never set countdown times again.

youdao