杭电：1001 Sum Problem java实现

Sum Problem

Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 623141    Accepted Submission(s): 157688

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

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Sum Problem

Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 623141    Accepted Submission(s): 157688

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

Recommend

We have carefully selected several similar problems for you:  1002 1090 1003 1091 1004 

import java.util.Scanner;

public class Main {
	
	private static Scanner sc = new Scanner(System.in);

	public static void main(String[] args) {
	
	while(sc.hasNextInt()) {
		int a = sc.nextInt();
		int sum = 0;
		for(int i=1;i<=a;i++) {
			sum += i;
		}
		System.out.println(sum);
		System.out.println();
		}
	}
}