Sum Problem

Time Limit: 1000/500 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 570855 Accepted Submission(s): 144823

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

Author
DOOM III

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代码：

#include"stdio.h"

int main()
{
    int n, sum = 0;
    while(scanf("%d",&n)==1)
    {
        sum = 0;
        for(int i = 1; i <= n; i++)
        {
            sum += i;
        }
        printf("%d\n\n",sum);
    }
}

注意点

1. include"stdio.h"
2. printf没有&
3. 要求答案后空一行需要两个\n