macOS C++ in Xcode

/* OS Questioneer 1.0.0
   By Jonathan Vasquez
   Made on 11/25/07
   Last updated on 11/25/07
*/

#include <iostream>

using std::cout;
using std::cin;
using std::endl;

int main (int argc, char * const argv[])
{
	int switchOne;
	
	cout << "What Operating System are you using ?" << endl;
	cout << "1. Mac OS X" << endl;
	cout << "2. Windows *" << endl;
	cout << "3. Linux" << endl;
	cout << "Current Selection: ";
	cin >> switchOne;
	
	switch( switchOne )
	{
		int switchTwo;
		
		case 1:
			cout << "You selected Mac OS X" << endl << endl;
			cout << "What OS X version are you using ?" << endl;
			cout << "1. 10" << endl;
			cout << "2. 10.1" << endl;
			cout << "3. 10.2" << endl;
			cout << "4. 10.3" << endl;
			cout << "5. 10.4" << endl;
			cout << "6. 10.5" << endl;
			
			cin >> switchTwo;
			
			switch( switchTwo )
			{
				
				case 1:
					cout << "You have selected version 10 - Too Old To Remember." << endl;
					break;
				case 2:
					cout << "You have selected version 10.1 - Too Old To Remember." << endl;
					break;
				case 3:
					cout << "You have selected version 10.2 - Puma" << endl;
					break;
				case 4:
					cout << "You have selected version 10.3 - Panther" << endl;
					break;
				case 5:
					cout << "You have selected version 10.4 - Tiger" << endl;
					break;
				case 6:
					cout << "You have selected version 10.5 - Leopard" << endl;
					break;
				default:
					cout << "You haven't selected a proper version, closing.";
					break;
					
			}
			
			break;
		case 2:
			
			cout << "You selected Windows *" << endl << endl;
			cout << "What Windows version are you using ?" << endl;
			cout << "1. 1.0" << endl;
			cout << "2. 3.0(1)" << endl;
			cout << "3. 95"<< endl;
			cout << "4. 98" << endl;
			cout << "5. ME/2000" << endl;
			cout << "6. XP" << endl;
			cout << "7. VISTA" << endl;
			
			cin >> switchTwo;	
			
			switch( switchTwo )
			{
				
				case 1:
					cout << "You have selected 1.0." << endl;
					break;
				case 2:
					cout << "You have selected 3.0(1)." << endl;
					break;
				case 3:
					cout << "You have selected 95." << endl;
					break;
				case 4:
					cout << "You have selected 98." << endl;
					break;
				case 5:
					cout << "You have selected ME/2000." << endl;
					break;
				case 6:
					cout << "You have selected XP." << endl;
					break;
				case 7:
					cout << "You have selected VISTA." << endl;
					break;
				default:
					cout << "You haven't selected a proper version, closing.";
					break;
			}
		
			break;
		case 3:
			
			cout << "You have selected Linux" << endl << endl;
			cout << "What distro of Linux are you using ?" << endl;
			cout << "1. Debian or Deritive" << endl;
			cout << "2. Red Hat or Deritive" << endl;
			cout << "3. Slackware or Deritive" << endl;
			cout << "4. Other" << endl;
			
			cin >> switchTwo;
			
			switch( switchTwo )
			{
				
				case 1:
					cout << "You have selected Debian or Deritive." << endl;
					break;
				case 2:
					cout << "You have selected Red Hat or Deritive." << endl;
					break;
				case 3:
					cout << "You have selected Slackware or Deritive." << endl;
					break;
				case 4:
					cout << "You have selected Other." << endl;
					break;
				default:
					cout << "You haven't selected a proper distro, closing.";
					break;
			}
			
			break;
			
		default:
			cout << "You have not selected anything, closing.";
			break;
	}

    return 0;
}

#include <iostream>

int main (int argc, char * const argv[]) {
    // insert code here...
    std::cout << "Hello, World!\n";
    return 0;
}