#include <allegro.h>

#define RIGHT 3 //you can change these values depending on how much you want the player to move in each direction 
#define LEFT 3 
#define UP 3 
#define DOWN 3 

void setup(); 
void shutdown(); 
void redraw(); 

BITMAP *character; 
BITMAP *buffer; 

short x = 0, y =0;

int main() 
 {
   setup();

   x = SCREEN_W / 2;
   y = SCREEN_W / 2;

   redraw();

   while(!key[KEY_ESC]) //while Esc key isn't pressed
    {
     if (key[KEY_RIGHT] && (x + RIGHT < SCREEN_W))
      x += RIGHT;
     else if (key[KEY_LEFT] && (x - lEFT > 0))
      x -= LEFT;
     else if (key[KEY_UP] && (y - UP > 0))
      y -= UP;
     else if (key[KEY_DOWN] && (y + DOWN < SCREEN_H))
      y += DOWN;

     redraw();
    }

   shutdown();

 return 0;
 }

END_OF_MAIN();

void setup() 
 {
   allegro_init(); //initializes allegro
   install_keyboard(); //installs the keyboard routines
   set_color_depth(32); //this is setting the color depth to a true color mode
   set_gfx_mode(GFX_AUTODETECT_FULLSCREEN, 640, 480, 0, 0); //setting the screen to 640, 480 resolution in fullscreen

   buffer = create_bitmap(SCREEN_W, SCREEN_H); //creating the buffer as the same size as the screen
   character = load_bitmap("name_of_bitmap.bmp", NULL); //loading the character bitmap
 }

void shutdown() 
 {
   clear_keybuf();
   destroy_bitmap(buffer);
   destroy_bitmap(character);
 }

void redraw() 
 {
   clear_bitmap(buffer); //clearing the buffer

   draw_sprite(buffer, character, x, y); //drawing the character bmp to the buffer
   blit(buffer, screen, 0, 0, 0, 0, SCREEN_W, SCREEN_H); //blitting the buffer to the screen so you can see everything
 }