HDU 1001 Sum Problem C/C++

时间：2015-02-06 20:27:57 阅读：167 评论：0 收藏：0 [点我收藏+]

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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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原文地址：http://www.cnblogs.com/heiqi/p/4277909.html

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