#include <graphics.h> 
#include <stdlib.h> 
#include <stdio.h> 
#include <conio.h> 

int main(void) 
{ 
   /* request auto detection */ 
   int gdriver = DETECT, gmode, errorcode; 
   int color, maxcolor, ht; 
   int y = 10; 
   char msg[80]; 

   /* initialize graphics and local variables */ 
   initgraph(&gdriver, &gmode, ""); 

   /* read result of initialization */ 
   errorcode = graphresult(); 
   if (errorcode != grOk)  /* an error occurred */ 
   { 
      printf("Graphics error: %s\n", grapherrormsg(errorcode)); 
      printf("Press any key to halt:"); 
      getch(); 
      exit(1); /* terminate with an error code */ 
   } 

   maxcolor = getmaxcolor(); 
   ht = 2 * textheight("W"); 

   /* display the default colors */ 
   for (color=1; color<=maxcolor; color++) 
   { 
      setcolor(color); 
      sprintf(msg, "Color: %d", color); 
      outtextxy(1, y, msg); 
      y += ht; 
   } 

   /* wait for a key */ 
   getch(); 

   /* black out the colors one by one */ 
   for (color=1; color<=maxcolor; color++) 
   { 
      setpalette(color, BLACK); 
      getch(); 
   } 

   /* clean up */ 
   closegraph(); 
   return 0; 
}