where is wrong？
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#include<stdio.h>
#include<stdlib.h>
int main()
{   int number;
    int i;
    int sum;
         while(scanf("%d",&number)!=EOF){
                         if (number>=0)
                                       sum=(number*(number+1))/2;
                         else if(number<0)
                                       sum=(number*(1-number))/2+1;
                         printf("%d\n",sum);

         }
 return 0;
}

Edited by author 02.11.2007 21:42

ac!