acm 杭电 1001 sum

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1.题目

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


2.my answer

#include <stdio.h>int main(){int n;int i = 0;int sum = 0;while(scanf("%d",&n) != EOF){sum = 0;for(i=1; i<=n; i++)sum += i;printf("%d\n\n",sum);}}//1.while 循环后要对sum重新赋值否走会使用上一次的结果出错//2.Presentation Error 少了一个换行


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