[Timus Online Judge] 1068. Sum

This question is too simple.

Time Limit: 2.0 second Memory Limit: 16 MB Your task is to find the sum of all integer numbers lying between 1 and N inclusive. Input The input consists of a single integer N that is not greater than 10000 by it's absolute value. Output Write a single integer number that is the sum of all integer numbers lying between 1 and N inclusive. Sample input -3 output -5

#include
#include

int main(){
   int i,num,sum;
   scanf("%d",&num);
   
   sum = 0;
   if ( num > 0)
        for(i = 1 ; i <= num ; i ++)
             sum += i;
   else
        for(i = 1 ; i >= num ; i --)
             sum+=i;

   printf("%d",sum);

return 0;
}