一个数的阶乘的Python程序-yiteyi-C++库

非负整数的阶乘是所有小于或等于n的整数的乘积。例如，6的阶乘是6*5*4*3*2*1，即720。

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factorial

1.递归：

Python3

                         # Python 3 program to find                       
                         # factorial of given number                       
                         def                                     factorial(n):                       
                                   
                                                 # single line to find factorial                       
                                                 return                                     1                                     if                                     (n                                     =                                     =                                     1                                     or                                     n                                     =                                     =                                     0                                     )                                     else                                     n                                     *                                     factorial(n                                     -                                     1                                     );                       
           
                         # Driver Code                       
                         num                                     =                                     5                                     ;                       
                         print                                     (                                     "Factorial of"                                     ,num,                                     "is"                                     ,                       
                         factorial(num))                       
           
                         # This code is contributed by Smitha Dinesh Semwal                       

输出：

Factorial of 5 is 120

2.迭代：

Python3

                         # Python 3 program to find                       
                         # factorial of given number                       
                         def                                     factorial(n):                       
                                                 if                                     n <                                     0                                     :                       
                                                 return                                     0                       
                                                 elif                                     n                                     =                                     =                                     0                                     or                                     n                                     =                                     =                                     1                                     :                       
                                                 return                                     1                       
                                                 else                                     :                       
                                                 fact                                     =                                     1                       
                                                 while                                     (n >                                     1                                     ):                       
                                                 fact                                     *                                     =                                     n                       
                                                 n                                     -                                     =                                     1                       
                                                 return                                     fact                       
           
                         # Driver Code                       
                         num                                     =                                     5                                     ;                       
                         print                                     (                                     "Factorial of"                                     ,num,                                     "is"                                     ,                       
                         factorial(num))                       
           
                         # This code is contributed by Dharmik Thakkar                       

输出：

Factorial of 5 is 120

3.单线溶液（使用三元运算符）：

Python3

                         # Python 3 program to find                       
                         # factorial of given number                       
           
                         def                                     factorial(n):                       
           
                                                 # single line to find factorial                       
                                                 return                                     1                                     if                                     (n                                     =                                     =                                     1                                     or                                     n                                     =                                     =                                     0                                     )                                     else                                     n                                     *                                     factorial(n                                     -                                     1                                     )                       
           
           
                         # Driver Code                       
                         num                                     =                                     5                       
                         print                                     (                                     "Factorial of"                                     ,num,                                     "is"                                     ,                       
                                                 factorial(num))                       
           
                         # This code is contributed                       
                         # by Smitha Dinesh Semwal.                       

输出：

Factorial of 5 is 120

请参阅完整的文章一个数的阶乘程序更多细节！

4.通过使用内置功能：

Python3

                         # Python 3 program to find                       
                         # factorial of given number                       
                         import                                     math                       
           
                         def                                     factorial(n):                       
                                                 return                                     (math.factorial(n))                       
           
           
                         # Driver Code                       
                         num                                     =                                     5                       
                         print                                     (                                     "Factorial of"                                     , num,                                     "is"                                     ,                       
                                                 factorial(num))                       
           
                         # This code is contributed by Ashutosh Pandit                       

输出：

Factorial of 5 is 120

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