HDUOJ-1001-Sum-Problem

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

Code

import java.io.BufferedInputStream;
import java.util.Scanner;

public class Main {
    private static Scanner in = new Scanner(new BufferedInputStream(System.in));
    public static void main(String[] args) {
        while (in.hasNext()) {
            int i = in.nextInt();
            int s = 0;
            for(int j = 1;  j <= i; j++) {
                s += j;
            }
            System.out.println(s);
            System.out.println();
        }
    }
}

Result

Run ID	Submit Time	Judge Status	Pro.ID	Exe.Time	Exe.Memory	Code Len.	Language	Author
24605141	2018-05-02 00:44:21	Accepted	1001	280MS	9616K	405 B	Java	pyjcak