杭电oj-1001(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

Author

DOOM III

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简述一下哈，最近真是无聊，真是没事干，所以打算每天抽出几个小时来做做题，正直七夕哈，祝大家有情人终成眷属，表白的都成功，我打算敲一天代码，new一天对象，O(∩_∩)O哈哈~

当然这是最简单的一道题啦，所以我就不说思路咯，说一下用java A题的应该注意的事项：

1.必须要导包，千万不能忘记了

2.类名必须为Main

3.要注意输入、输出的格式

代码：

import java.util.Scanner;

public class Main1001 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int result = 0;
        while (in.hasNextInt()) {
            int a = in.nextInt();
            for (int i = 1; i <= a; i++) {
                result = result + i;
            }
            System.out.println(result);
            System.out.println();
            result = 0;
        }
    }
}