（java）杭电acm 题号：1001 Sum Problem

Sum Problem

Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 479541    Accepted Submission(s): 121267

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

1
5050
package acm;import java.util.Scanner;/** * * @author  */public class Main {    public static void main(String[] args) {        Scanner input = new Scanner(System.in);        while (input.hasNext()) {            int A = 1;            int S = 0;            int n = input.nextInt();            while (A <= n) {                S = S + A;                A++;            }            System.out.println(S);            System.out.println("");        }    }}