杭电acmP1001

Sum Problem
Time Limit: 1000/500 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 517949 Accepted Submission(s): 131365

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

import java.util.Scanner;public class Main {    public static void main(String[] args) {        Scanner sc=new Scanner(System.in);        while(sc.hasNext()){            int n=sc.nextInt();            int sum=0;            for(int i=1;i<=n;i++){                sum+=i;            }            System.out.println(sum);            System.out.println();        }    }}