复制代码 代码如下:

#include <stdio.h>

#include <string.h>

const int maxn = 3000;

int f[maxn];

int main()

{

int i,j,n;

scanf("%d",&n);

memset(f,0,sizeof(f));

f[0] = 1;

for(i = 2;i <= n;i++)

{

int c = 0;

for(j = 0;j < maxn;j++)

{

int s = f[j] * i + c;

f[j] = s % 10;

c = s / 10;

}

}

for(j = maxn - 1;j >= 0;j--) if(f[j]) break;

for(i = j;i >= 0;i--) printf("%d",f[i]);

printf("n");

return 0;

}