本文通过一个实例介绍了如何使用C语言进行基本的输入输出操作，实现求N个数字之和的功能。通过`#include<stdio.h>`引入标准输入输出库，然后利用`printf`函数进行输出。
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.
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
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