C++程序求简单数列和

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