Python 阶乘实例
Python 3 教程
· 2019-02-12 11:56:57
整数的阶乘(英语:factorial)是所有小于及等于该数的正整数的积,0的阶乘为1。即:n!=1×2×3×...×n。
实例
#!/usr/bin/python3
# Filename : test.py
# author by : www.codercto.com
# 通过用户输入数字计算阶乘
# 获取用户输入的数字
num = int(input("请输入一个数字: "))
factorial = 1
# 查看数字是负数,0 或 正数
if num < 0:
print("抱歉,负数没有阶乘")
elif num == 0:
print("0 的阶乘为 1")
else:
for i in range(1,num + 1):
factorial = factorial*i
print("%d 的阶乘为 %d" %(num,factorial))
执行以上代码输出结果为:
请输入一个数字: 3 3 的阶乘为 6
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