HDOJ Sum Problem

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Sum Problem

Time Limit: 1000/500 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 269231 Accepted Submission(s): 66999

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

Sample Output

15050
AC代码：基础热身题-水题（不解释）
package com.ACM;import java.util.Scanner;public class Sum {public static void main(String[] args) {Scanner in = new Scanner(System.in);while(in.hasNextInt()){int n = in.nextInt();int sum = 0;while(n>0){sum += n;n--;}System.out.println(sum);System.out.println();}}}

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