一个数的阶乘的C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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递归：

                     // C program to find factorial of given number                   
                             
                     #include <stdio.h>                   
                             
                     // Function to find factorial of given number                   
                     unsigned                               int                               factorial(unsigned                               int                               n)                   
                     {                   
                                         if                               (n == 0)                   
                                         return                               1;                   
                                         return                               n * factorial(n - 1);                   
                     }                   
                             
                     // Driver code                   
                     int                               main()                   
                     {                   
                                         int                               num = 5;                   
                                         printf                               (                               "Factorial of %d is %d"                               ,                   
                                         num, factorial(num));                   
                                         return                               0;                   
                     }                   

输出：

Factorial of 5 is 120

迭代：

                     #include <stdio.h>                   
                             
                     // Function to find factorial of given number                   
                     unsigned                               int                               factorial(unsigned                               int                               n)                   
                     {                   
                                         int                               res = 1, i;                   
                                         for                               (i = 2; i <= n; i++)                   
                                         res *= i;                   
                                         return                               res;                   
                     }                   
                             
                     // Driver code                   
                     int                               main()                   
                     {                   
                                         int                               num = 5;                   
                                         printf                               (                               "Factorial of %d is %d"                               ,                   
                                         num, factorial(num));                   
                                         return                               0;                   
                     }                   

输出：

Factorial of 5 is 120

单线溶液（使用三元运算符）：

                     // C++ program to find factorial of given number                   
                             
                     #include <iostream>                   
                             
                     int                               factorial(                               int                               n)                   
                     {                   
                                         // single line to find factorial                   
                                         return                               (n == 1 || n == 0)                   
                                         ? 1                   
                                         : n * factorial(n - 1);                   
                     }                   
                             
                     // Driver code                   
                     int                               main()                   
                     {                   
                                         int                               num = 5;                   
                                         printf                               (                               "Factorial of %d is %d"                               ,                   
                                         num, factorial(num));                   
                                         return                               0;                   
                     }                   
                     // This code is contributed by  Rithika palaniswamy.                   

输出：

Factorial of 5 is 120

使用tgamma（）方法：

例子：

Input: n = 4
Output: 24

语法：

tgamma(n+1)=n!
It works upto 20! because c can't store large value

实施： 使用数学h头申请这个

                     #include <math.h>                   
                     #include <stdio.h>                   
                             
                     int                               main()                   
                     {                   
                             
                                         // use long long int                   
                                         // for larger values of n                   
                                         int                               n = 4;                   
                             
                                         // tgamma(n+1)=n!                   
                                         n = tgamma(n + 1);                   
                             
                                         printf                               (                               "%d"                               , n);                   
                                         return                               0;                   
                                         // This code is contributed by Soumyadip Basak                   
                     }                   

输出：

上述解决方案会导致大量数据溢出。请参考大数阶乘这是一个适用于大量数据的解决方案。

请参阅完整的文章一个数的阶乘程序更多细节！

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