#include <graphics.h>
void rectangle(int left, int top, int right, int bottom);
 

rectangle draws a rectangle in the current line style, thickness, and
drawing color.
(left,top) is the upper left corner of the rectangle, and (right,bottom)
is its lower right corner.

/* rectangle example */
 
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
 
int main(void)
{
   /* request autodetection */
   int gdriver = DETECT, gmode, errorcode;
   int left, top, right, bottom;
 
   /* 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 */
   }
 
   left = getmaxx() / 2 - 50;
   top = getmaxy() / 2 - 50;
   right = getmaxx() / 2 + 50;
   bottom = getmaxy() / 2 + 50;
 
   /* draw a rectangle */
   rectangle(left,top,right,bottom);
 
   /* clean up */
   getch();
   closegraph();
   return 0;
}

bar bar3d setcolor setlinestyle

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