Sum Problem

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 Input
1
100

Sample Output
1

5050

注意格式，每个输出后要有1个空行，要注意怎么结束循环

C

#include <stdio.h>
#pragma warning(disable:4996)
int main(void)
{
int N,sum,i;
while(scanf("%d",&N)!=EOF)
{
for(sum=0,i=1;i<=N;i++)
sum+=i;
printf("%d\n\n",sum);
}
return 0;
}

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