老娘的Java入门啦之——几道杭电上的入门题 1001

最新推荐文章于 2018-07-25 15:11:52 发布

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本文详细解析了HDOJ平台上的经典求和问题，通过一个简单的算法，实现从1到任意整数n的累加求和。代码示例采用Java语言，展示了如何读取输入并计算累加和。

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1001

Sum Problem

Time Limit: 1000/500 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 556816 Accepted Submission(s): 141111

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

100

Sample Output

5050

题意概括：输入一个数，输出从1到这个数的累加和。

AC代码：

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