In what order does the console read the code?

Eddie Risto (7)
Hey guys. Second post :D

So, I have a question. I'm about a week into this whole C++ nonsense, and I'm beginning to see something I didn't expect. As far as programming experience, I'm pretty good at QBASIC, and TBASIC; programming calculators. In both of those languages, the console reads the code top down, going from each line to the next and executing the code until it sees a :goto Lbl .

That being said, that's my understanding of programming. So, in a basic counting program like below, is that the methodology used? Does the console read the code and execute starting with the first thing it sees? 

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#include <iostream>
using namespace std;

int main ()
{
    long n, a;
    a = 0;
    cout << "What number would you like to count to?";
    cin >> n;
    while (a < n)
        cout << a << endl, a=a+1;
    while (a < 0)
        cout << "Error, please enter a positive number";
    if (n = a)
        cout << n;
    return 0;
}


Perhaps a better question, more practical; if I were to switch the places of both of those while routines, would it make any difference in the way the code is read and executed?

Thanks in advance.
giblit (3750)
The code is read from left - > right from top - > bottom.

Try this for example:
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#include <iostream> //std::cout , std::flush , std::endl
int main()
{
    std::cout << "Hello " << std::flush;
    std::cout << "world!" << std::endl;
}
 
Hello world!

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#include <iostream> //std::cout , std::flush , std::endl;
int main()
{
    std::cout << "world!" << std::flush;
    std::cout << "Hello " << std::endl;
}
 
world!Hello
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