Since factorials of numbers less than 1 don't make any sense, we stop at the number 1 and return the factorial of 1 (which is 1). Therefore, the real factorial function will look like this

由于小于1的数的阶乘没有任何意义，所以我们在计算到数字 1 的时候停止，并返回 1的阶乘（即 1）。

youdao

Since factorials of numbers less than 1 don't make any sense, we stop at the number 1 and return the factorial of 1 (which is 1). Therefore, the real factorial function will look like this

由于小于1的数的阶乘没有任何意义，所以我们在计算到数字 1 的时候停止，并返回 1的阶乘（即 1）。

youdao