Sum Problem

Time Limit: 1000/500 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 444200 Accepted Submission(s): 111616

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

水题，注意数据范围

#include <stdio.h>
int main ()
{
    int N=1,n,t=1;
    while(scanf("%d",&n)!=EOF){
        int sum=0;
        for (N=1;N<=n;N++)
        {
            sum+=N;
        }
        printf("%d\n\n",sum);
    }
    return 0;
}