New user to C++ on a Mac using xcode. Trying to use IDE correctly

First, I'm very new to programming and C++ so if I made a huge flaw in the code below, forgive me...it's possible I screwed up bigtime. I am trying to make a very, very basic program just so I can get started using xcode on my Mac instead of codeblocks on my pc to compile C++ programs

#include <iostream>
using namespace std;

int main(int argc, const char * argv[])
{
    int a,b,c,d,e,f,g;
    cout << "Enter 6 numbers: ";
    cin >> a >> b >> c >> d >> e >> f >> g;
    cout << a << b;
    return 0;
}

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The above code outputs:

Enter 6 numbers: 

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when I type in the 6 numbers ( as '1 2 3 4 5 6')and hit enter, the rest of the program does not run(the   cout << a << b;). I tried running the program from bash also but that too was not working. I'm feeling really dumb right now. Can someone tell me what I'm doing wrong?