ACM 阶乘的精确值

#include<stdio.h>
int ans[40];
int main()
{
memset(ans, 0, sizeof(ans));
int n,c=0;
scanf("%d", &n);
ans[1] = 1;
for (int i = 2; i <= n; i++)
{
for (int j = 0; j < 40; j++)
{
int temp = ans[j] * i + c;
ans[j] = temp % 10;
c = temp / 10;
}
}
int p = 0;
for (int i = 39; i >= 0;i--)
if (ans[i] || p)
{
printf("%d", ans[i]); p = 1;
}
printf("\n");
//system("pause");
return 0;
}