大数阶乘

50

30414093201713378043612608166064768844377641568960512000000000000

 1 #include <stdio.h>
 2 #include <string.h>
 3 
 4 #define N 3000 
 5 
 6 int main()
 7 {
 8     int a[N];
 9     int n, i, j, c, s;
10     memset(a, 0, sizeof(a));
11     scanf("%d", &n);
12     a[0] = 1;
13     for (i = 2; i <= n; i++)
14     {
15         c = 0;
16         for (j = 0; j < N; j++)
17         {
18             s = a[j] * i + c;
19             a[j] = s % 10;
20             c = s / 10;
21         }
22     }
23     for (i = N - 1; i >= 0; i--)
24     {
25         if (a[i])
26         {
27             break;
28         }
29     }
30     for (j = i; j >= 0; j--)
31     {
32         printf("%d", a[j]);
33     }
34     return 0;
35 }