I don't know why I always get "wrong answer" for submitting
my pascal program, solving this problem. I'd be pleased if
someone will give me code, that solves it (I'm just curious
what is wrong in my program).

> I don't know why I always get "wrong answer" for
submitting
> my pascal program, solving this problem. I'd be pleased
if
> someone will give me code, that solves it (I'm just
curious
> what is wrong in my program).
Here is my source : (C++)

#include <stdio.h>

int i;long sum=0;
int n;

void main()
 {
  scanf("%d",&n);
  if(n<1)
   for(i=1;i>=n;i--)
    sum+=i;
  else
   for(i=1;i<=n;i++)
    sum+=i;
  printf("%ld",sum);
 }