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", & )! = EOF)
7 {
8 sum = 0;
9 for (I = 1; I <= a; I ++)
10 sum = sum + I;
11 printf ("% d \ n", sum );
12}
13}
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By Ren qilei