HDOJ 1001Sum 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

import java.util.*;
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();
  }
  }

}
  

 

  
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原文链接：chenhx.blog.csdn.net/article/details/49334627