i am not sure why i am getting this error.please help.my code is given below.
#include<stdio.h>
double find_ncr(unsigned long long n,unsigned long long r)
{
if(n<r)
return 0;
else if(n==r)
return 1;
else if(r==1)
return n;
if(n==1)
return 1;
return find_ncr(n-1,r)+find_ncr(n-1,r-1);
}
int main()
{
unsigned long long n, r;
unsigned long long t;
scanf("%llu",&t);
while(t--)
{
scanf("%llu%llu",&n,&r);
if(r<=n/2)
printf("%.0lf\n",find_ncr(n-1,r-1));
else
printf("%.0lf\n",find_ncr(n-1,n-r));
}
return 0;
}