Probably and easy one

I need to know what the output of the following three line is:

vector<int> v;
v.push_back (3);
cout<<v[0];

Thanks

give it a thought...

I need to know why you cant write a program to find out.

Mmm - 5 seconds to try it with your own compiler?
Several hours to wait for replies telling you to use your compiler.

That's tough.