textprintf_ex or al_draw_textf depending on your Allegro version.

Considering that we shouldn't "underestimate your noobyness", I'll assume you're using A4 since A5 is more complicated to setup so, with that being said:

int HP = 100;

textprintf_ex(screen,font,5,5,makecol(255,255,255),-1,"Health: %d",HP);

A little not-so-pseudo-code for you to use to your hearts content. Also. Don't blit to the screen. Use double buffering.

I'm not the best at problem solving or programming concept in general so when someone has a problem that I actually can answer, I go all out with it xD

I'm using Allegro 4.2.3. Here's my code right now:
-----------------------------------------------------------
#include <allegro.h>
#include <iostream>
#include <cstring>
using namespace std ;

int main ()
{
allegro_init ();
install_keyboard ();
install_mouse ();
set_color_depth (16);
set_gfx_mode (GFX_AUTODETECT_WINDOWED , 640, 480, 0, 0);
set_window_title ("HP in RPG"); // sets title of

BITMAP *Buffer = create_bitmap (800, 600);

string hp1 = "100" ;

textout_ex(Buffer , font , hp1.c_str() , 10 , 10 , makecol(255,255,255) , makecol(0,0,0));

textprintf_ex(Buffer , font , 10 , 30 , makecol(255,255,255) , -1 , "HP: %s" , hp1.c_str());

blit (Buffer , screen , 0, 0, 0, 0, 640, 480);
rest (40) ;
clear_bitmap (Buffer);

readkey (); // just waits for user to press any key to continue
return 0;
}
END_OF_MAIN ()
-----------------------------------------------------------

Notice that we are displaying HP. But, it's a string rather than an integer, so I don't know how to make this value go down when I get hit. Lots of games display your HP, so this must be simple, no?

Solved! Thank you so much, Norther! Hugs Norther

PS. Huh??? What is Double Buffering? Could you please put it into my updated code?

-----------------
#include <allegro.h>
#include <iostream>
#include <cstring>
using namespace std ;

int main ()
{
allegro_init ();
install_keyboard ();
install_mouse ();
set_color_depth (16);
set_gfx_mode (GFX_AUTODETECT_WINDOWED , 640, 480, 0, 0);
set_window_title ("HP in RPG"); // sets title of

BITMAP *Buffer = create_bitmap (800, 600);
bool done = false ;
int HP = 100;

while (done == false)
{
if (key[KEY_ESC])
done = true ;
if (key[KEY_DOWN])
HP -- ;
if (key[KEY_UP])
HP ++ ;

textprintf_ex(Buffer,font,5,5,makecol(255,255,255),-1,"Health: %d", HP );
blit (Buffer , screen , 0, 0, 0, 0, 640, 480);
rest (40) ;

clear_bitmap (Buffer);
}

readkey (); // just waits for user to press any key to continue
return 0;
}
END_OF_MAIN ()
----------

Please do not answer in the format that Trent Gamblin did. I had no idea what he meant. As I said, I am a complete n00b and will not understand what you mean unless I see the code on action.
Thanks again so much, Norther.

Why are you even helping this entitled-acting child? This might be the worst case of noob-rudeness I've seen on this forum, and we've had a LOT.

Judging by his answers, he lacks the basic level of engagement and/or willingness to search for answers to learn programming, so stop wasting your time.

You have to appreciate his honesty.

Attitude? Have a lot of thin skin?

That page is incredibly useless. The intersection of the people willing to read all of that and the people who ask dumb questions is empty.

I still remember that raging frenchman who came here and asked a beginner level question. When we responded with answers about googling and searching the forum, his response contained a commodious amount of profanity, vulgarity, and what I like to call the Angry Ghetto Six Year Old Syndrome :x

@OP: There's only one thing wrong with the double buffering you have now and that's the fact that you made the buffer (800,600) bigger than the screen (640,480). they should be the same size (unless you're doing some sort of software map scrolling, in which case I don't think that's what you're getting at.)