hdu1001

Sum Problem

Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 194488    Accepted Submission(s): 46632

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

 

 

 

 

1. #include<iostream>
2. using namespace std;
3. int main()
4. {
5.     int n,sum,i;
6.     while(cin>>n)
7.     {
8.         sum=0;
9.             for(i=1;i<=n;i++)
10.             sum+=i;
11.         cout<<sum<<endl<<endl;
12.     }
13.     return 0;
14. }