杭电ACM1001

原题：http://acm.hdu.edu.cn/showproblem.php?pid=1001

#include <stdio.h>

int main(void)
{
    int i,n,sum;
    sum = 0;
    while(scanf("%d",&n)!=EOF)
    {
        sum=0;
        for (i=0;i<=n;i++)
            sum+=i;
        printf("%d

",sum);
    }
    return 0;
}

Sum Problem

Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 416900    Accepted Submission(s): 105068

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