1001.Sum Problem
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1001.Sum Problem

2014-09-10

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.
计算1 + 2 + 3 + …… + n的值
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

Solution

  这个就是按照题意,直接for循环到n就可以解决了

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

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