C++ 序列求和

#include<iostream>
using namespace std;

int main()
{
	unsigned long i,j,count=0; //unsigned long : 0-4,294,967,295

	cin>>j;

	for(i=0;i<=j;i++)
	{
		count=count+i;
	}

	cout<<count<<endl;

	cin.get();
	return 0;
}

原文：https://www.cnblogs.com/l574/p/14983617.html