small factorials , FCTRL2 . why my code is not working??

 #include<stdio.h>
 long int f(int);
 int main()
 {
 int t,n;
 scanf("%d",&t);
 if(t>=0 && t<=100)
 while(t)
 {scanf("%d",&n);
 if(n>=0 && n<=100)
 printf("%ld\n",f(n));
 else return 0;
 t--;
}
return 0;
}

long int f(int n)
{ if (n==1 || n == 0)
return 1;
else
return n*f(n-1);
}