HD 1001 sum problem

Sum Problem

Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 277338    Accepted Submission(s): 69276

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

1100

 

Sample Output

15050

 

Author

DOOM III

 

Recommend

#include<stdio.h>

int main()
{
   int n,i,sum=0;
   while(scanf("%d",&n)!=EOF)
   {
     for(i=1;i<=n;i++)
     sum+=i;
     printf("%d\n\n",sum);
     sum=0;
                             }
      return 0;
      }