双长型整数咋定义

#include<stdio.h>
int main()
{
    int n,i,j,t1=1,m=0; long long int t2=0;//对应报错是error C2632: 'long' followed by 'long' is illegal
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        for(j=1,t1=1;j<=i;j++)//最容易遗漏的就是t1=1
        {
            t1=t1*(-j);
        }
        t2=t2-t1;
    }
    printf("%3d   %5d\n",n,t2);
}