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Problem Description

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

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#include<iostream.h>
void main()
{
int n,temp,sum;
cout<<"ÇëÊäÈëÒ»¸öÕûÊýn:";
cin>>n>>endl;
for(temp=n;temp<=n;temp++)
{
sum+=temp;
}
cout<<sum<<endl;
}

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int sum()
{
cout<<"Please input a series of integers(end with 0).\n";
int i,sum=0;
while(cin>>i,i!=0)
sum+=i;
return sum;
}