// myfirst.cpp -- displays a message

#include <iostream>                           // a PREPROCESSOR directive
int main()                                    // function header
{                                             // start of function body
    using namespace std;                      // make definitions visible
    cout << "Come up and C++ me some time.";  // message
    cout << endl;                             // start a new line
    cout << "You won't regret it!" << endl;   // more output
    cin.get();return 0;                       // terminate main()
}   

不懂????