HDU 1002 Sum Problem

Sum Problem

Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 223816    Accepted Submission(s): 54902

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

 

思路：

 

代码:

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