#include <graphics.h>
void setcolor(int color);
 

setcolor sets the current drawing color to color, which can range from 0
to getmaxcolor. The current drawing color is the value to which pixels
are set when lines, and so on are drawn. The drawing colors shown below
are available for the CGA and EGA, respectively.
Palette Number  Three Colors
0     LIGHTGREEN ÂLIGHTRED YELLOW
1     LIGHTCYAN    LIGHTMAGENTA ÂWHITE
2     GREEN  REDBROWN
3     CYAN   MAGENTA  LIGHTGRAY
Name   Value
BLACK  0
BLUE   1
GREEN  2
CYAN   3
RED    4
MAGENTA5
BROWN  6
LIGHTGRAY    7
DARKGRAY     8
LIGHTBLUE    9
LIGHTGREEN   10
LIGHTCYAN    11
LIGHTRED     12
LIGHTMAGENTA 13
YELLOW 14
WHITE  15
You select a drawing color by passing either the color number itself or
the equivalent symbolic name to setcolor. For example, in CGAC0 mode, the
palette contains four colors: the background color, light green, light
red, and yellow. In this mode, either setcolor(3) or setcolor(CGA_YELLOW)
selects a drawing color of yellow.

/* setcolor example */
 
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
 
int main(void)
{
   /* select driver and mode that supports multiple drawing colors */
   int gdriver = EGA, gmode = EGAHI, errorcode;
   int color, maxcolor, x, y;
   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 */
   }
 
   /* maximum color index supported */
   maxcolor = getmaxcolor();
 
   /* for centering text messages */
   settextjustify(CENTER_TEXT, CENTER_TEXT);
   x = getmaxx() / 2;
   y = getmaxy() / 2;
 
   /* loop through the available colors */
   for (color=1; color<=maxcolor; color++) {
 
cleardevice();   /* clear the screen */
setcolor(color); /* select new background color */
 
/* output a messsage */
sprintf(msg, "Color: %d", color);
outtextxy(x, y, msg);
getch();
   }
 
   /* clean up */
   closegraph();
   return 0;
}

getcolor getmaxcolor graphresult setallpalette setbkcolor setpalette

  no output of example at the moment
  do not hesitate and add it...