Sum Problem

Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 469658    Accepted Submission(s): 118388

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

水题一道，题意就是计算1~n的和，唯一需要注意的是格式问题，每两个输出数据之间要多上一个换行

贴上代码：

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