1153: sum

1153: sum

1.描述

Hey, welcome toPDSU OJPingdingshan University Online Judge). In this problem, your task is to calculate SUM(n) = 1 + 2 + 3 + … + n.

输入
The input will consist of a series of integers n, and n>=0,end of file EOF,one integer per line.

输出
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.

样例输入
1
100
样例输出
1

5050

2.代码

非常简单的一道题，具体意思可以去百度翻译

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