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

getmaxy returns the maximum (screen-relative) y value for the current
graphics driver and mode.
For example, on a CGA in 320*200 mode, getmaxy returns 199. getmaxy is
invaluable for centering, determining the boundaries of a region
onscreen, and so on.

/* getmaxy example */
 
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
 
int main(void)
{
  /* request autodetection */
  int gdriver = DETECT, gmode, errorcode;
  int midx, midy;
  char xrange[80], yrange[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 */
  }
 
  midx = getmaxx() / 2;
  midy = getmaxy() / 2;
 
  /* convert max resolution values into strings */
  sprintf(xrange, "X values range from 0..%d", getmaxx());
  sprintf(yrange, "Y values range from 0..%d", getmaxy());
 
  /* display the information */
  settextjustify(CENTER_TEXT, CENTER_TEXT);
  outtextxy(midx, midy, xrange);
  outtextxy(midx, midy+textheight("W"), yrange);
 
 
  /* clean up */
  getch();
  closegraph();
  return 0;
}

getmaxx getwindowheight gety

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