杭电1001

最新推荐文章于 2021-02-12 20:43:24 发布

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最新推荐文章于 2021-02-12 20:43:24 发布

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文章标签： C语言杭电1001 ACM

本文链接：https://blog.youkuaiyun.com/qq_43535092/article/details/84189561

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杭电1001

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

#include<stdio.h>
main()
{
    int n,i,sum;   //定义：n为输入的数，sum是从一加到n的和。
    while(scanf("%d",&n)!=EOF) //为满足题目要求，输入多组数据
    {
        sum=0;
        for(i=1;i<=n;i++)	//此循环目的是为了使i从1加到n
        {sum=sum+i;}
        printf("%d\n",sum);
        printf("\n"); 	//注意题目要求上一个输出与下一个输出之间有一个空行
    }
    return 0;
}