1001 Sum Problem

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    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
    

    代码

    #include
    using namespace std;
    
    int main()
    {
         int i, n, sum;
         while(cin>>n)
         {
                sum=0;
                for(i=1; i<=n; i++)
                       sum+=i;
                cout<<sum<<endl<<endl;
         }
         return 0;
    }
    
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