Sum Problem
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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
15050
public class Main { public static void main(String[] args) { Scanner n1 = new Scanner(System.in); int result = 0; // Scanner n2= new Scanner(System.in); while (n1.hasNextInt()) { int n = n1.nextInt(); for (int i = 1; i <= n; i++) { result = result + i; } System.out.println(result); System.out.println();//换行 result = 0; } }}
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