Sum Problem

Time Limit : 1000/500ms (Java/Other) Memory Limit : 65536/32768K (Java/Other)
Total Submission(s) : 29 Accepted Submission(s) : 17

Problem Description Hey, welcome to HDOJ(Hangzhou Dianzi University Online Judge).

In this problem, your task is to calculate SUM(n) = 1 + 2 + 3 + … + n.

Input The input will consist of a series of integers n, one integer per line.

Output For each case, output SUM(n) in one line, followed by a blank line. You may assume the result will be in the range of 32-bit signed integer.

Sample Input1
100

Sample Output1

5050

#include<stdio.h>
int main()
{
 int sum,n;
 while(~scanf("%d",&n))
 {
  sum=0;
  for(int i=1;i<=n;i++)
   sum+=i;
  printf("%d\n\n",sum);
 }
 return 0;
}

注意格式！！！