Why isnt this code doing anything?

This is a discussion on Why isnt this code doing anything? within the C++ Programming forums, part of the General Programming Boards category; Im using dgjpp v2 and it compiles with no errors, it gives me exit code 255 (I have no idea ...

  1. #1
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    Jan 2003
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    118

    Why isnt this code doing anything?

    Im using dgjpp v2 and it compiles with no errors, it gives me exit code 255 (I have no idea what that means).

    But this does nothing, its supposed to draw a pixel and wait for a keypress....

    Code:
    #include <stdio.h>
    #include <stdlib.h>
    #include <dos.h>
    #include <conio.h>
    
    #define SCREEN_WIDTH 320
    #define SCREEN_HEIGHT 200
    
    typedef unsigned char byte;
    
    byte *VGA = (byte*)0xA0000;
    
    void enterMode13()
    {
    	union REGS regs;
    	regs.h.ah = 0x00;
    	regs.h.al = 0x13;
    	int86(0x10, &regs, &regs);
    }
    
    void exitMode13()
    {
    	union REGS regs;
    	regs.h.ah = 0x00;
    	regs.h.al = 0x03;
    	int86(0x10, &regs, &regs);
    }
    
    void plotPixel(int x, int y, byte color);
    
    int main()
    {
    	enterMode13();
    	plotPixel(0, 0, 5);
    	getch();
    	exitMode13();
    	
    	return 0;
    }
    
    void plotPixel(int x, int y, byte color)
    {
    	VGA[y*SCREEN_WIDTH+x] = color;
    }
    Last edited by Marcos; 10-15-2005 at 11:25 PM.
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