用 while 循环写阶乘 python

Question

我是新手，对Python了解不多。有人知道如何在 while 循环中编写阶乘吗？

我可以在 if / elif else 语句中实现：

num = ...
factorial = 1

if num < 0:
   print("must be positive")
elif num == 0:
   print("factorial = 1")
else:
   for i in range(1,num + 1):
       factorial = factorial*i
   print(num, factorial)

但我想用 while 循环（无功能）来做到这一点。

Answer 1

while num > 1:
    factorial = factorial * num
    num = num - 1

Answer 2

如果你只想得到一个结果：math.factorial(x)

While 循环：

def factorial(n):
    num = 1
    while n >= 1:
        num = num * n
        n = n - 1
    return num

用 while 循环写阶乘 python

Write factorial with while loop python

python

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factorial

while-loop