2019.4.14
第 1001 题: 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
解:
- package Acm;
- import java.util.Scanner;
- public class test1 {
- public static void main(String[] args)
- {
- Scanner input=new Scanner(System.in);
- int a;
- int b;
- int sum = 0;
- while(input.hasNext())
- {
- a=input.nextInt();
- for(int i=1;i<=a;i++){
- sum=sum+i;
- }
- System.out.println(sum);
- //System.out.println();
- sum=0;
- }
- }
- }
来源: http://www.bubuko.com/infodetail-3023867.html