#include <graphics.h>
void getviewsettings(struct viewporttype *viewport);
 

getviewsettings fills the viewporttype structure pointed to by viewport
with information about the current viewport.
The viewporttype structure used by getviewport is defined in graphics.h
as follows:
struct viewporttype {
   int left, top, right, bottom;
   int clip;
};

/* getviewsettings example */
 
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
 
char *clip[] = { "OFF", "ON" };
 
int main(void)
{
   /* request autodetection */
   int gdriver = DETECT, gmode, errorcode;
   struct viewporttype viewinfo;
   int midx, midy, ht;
   char topstr[80], botstr[80], clipstr[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;
 
   /* get information about current viewport */
   getviewsettings(&viewinfo);
 
   /* convert text information into strings */
  sprintf(topstr, "(%d, %d) is the upper left viewport
corner.",viewinfo.left, viewinfo.top);
 
  sprintf(botstr, "(%d, %d) is the lower right viewport
corner.",viewinfo.right, viewinfo.bottom);
   sprintf(clipstr, "Clipping is turned %s.", clip[viewinfo.clip]);
 
   /* display the information */
   settextjustify(CENTER_TEXT, CENTER_TEXT);
   ht = textheight("W");
   outtextxy(midx, midy, topstr);
   outtextxy(midx, midy+2*ht, botstr);
   outtextxy(midx, midy+4*ht, clipstr);
 
   /* clean up */
   getch();
   closegraph();
   return 0;
}

clearviewport getx gety setviewport

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