HDUacm 1001 Sum Problem

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
 
Codes:
 1 #include <stdio.h>
 2 main()
 3 {
 4     int a,i,sum;
 5    
 6     while(scanf("%d",&a)!=EOF)
 7     {
 8         sum=0;
 9         for(i=1;i<=a;i++)
10             sum=sum+i;
11         printf("%d/n/n",sum);
12     }
13 }
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 作者 任琦磊