ＨＤＵ １００１Sum Problem （ｊａｖａ）

Sum Problem

Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 517127    Accepted Submission(s): 131131

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

1100

 

Sample Output

15050

 

Author

DOOM III

 

题意容易理解，注意下格式

类名必须是Ｍａｉｎ

import java.util.Scanner;  class Ｍａｉｎ{        public static void main(String[] args) {        Scanner sc = new Scanner(System.in);        while(sc.hasNext()){            long n = sc.nextInt();            long sum = 0;              for(int i = 0; i<=n;i++){                  sum+=i;              }              System.out.println(sum);              System.out.println();         }      }    }