递归计算阶乘 n!

 1 #include <stdio.h>
 2 
 3 //递归求解 n！
 4 int recursion_n(int n)
 5 {
 6     if(n==1)
 7     return 1;
 8 
 9     else
10     return n*recursion_n(n-1);
11 }
12 
13 
14 int main(void)
15 {
16     int recursion_num;
17 
18     printf("please input the recursion num:");
19     scanf("%d",&recursion_num);
20 
21     printf("result is :%d\n",recursion_n(recursion_num));
22 
23     return 0;
24 }