Tiny bit more advanced calculator (Addition Only atm)

/////////////////////////////////////////
////	Eddie's Ownage Calculator    ////
/////////////////////////////////////////

#include "stdafx.h"
#include <iostream>
#include <string>
using namespace std;
void test()
{
	cout << "How many numbers?" << endl;
    int num;
    unsigned long int answer = 0;
    int nums;
    cin >> nums;
    cout << endl << "What operation would you like to use?" << endl;
    char choice;
    cin >> choice; 
    switch (choice)
    {
	case '+':
		for(int i = 0; i <= nums; i++)
		{
			if(i == 1)
			{
				cout << "First Number? \n";
				cin >> num;
				answer = num + answer;
			} else if(i >= 2) {
				cout << "Next Number? \n";
				cin >> num;
				answer = num + answer;
			}
		}
		break;
	case '-':
		break;
	case '*':
		break;
	case '/':
		break;
	}
	cout << "The answer is: " << answer << endl;
}
int main()
{
	test();
	system("pause");
	return 0;
}