I read a tutorial on entering VGA mode without a BGI file (I don't really know what that is or if I have one so I read it) and it said to enter VGA mode put this in the code:

Code:
void SetMCGA() {
  _AX = 0x0013;
  geninterrupt (0x10);
}
And i'm wondering if I need to include a header file (like iostream or something) because it gives me the error: "_AX undeclared (first use this function)" If so, where can I get it or does it come with Dev-C++?

I don't know really what to do about it. I've been coding in C++ for about... 1 1/4 days now, and I can make simple text based games and understand functions ok. I want to do graphical programming, though. I used to code in BASIC and DiNGS Game Basic. I use Dev-C++ with a standard Hewlett Pakard Pavilion with windows 98, if it makes any difference. Any help would be great, thanks in advance.