C Language Progarm for Set Visible Pages

#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

int main(void)

{

   /* select a driver and mode that supports */

   /* multiple pages.                        */

   int gdriver = EGA, gmode = EGAHI, errorcode;

   int x, y, ht;

   /* initialize graphics and local variables */

   initgraph(&gdriver, &gmode, "..//bgi");

   /* 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 */

   }

   x = getmaxx() / 2;

   y = getmaxy() / 2;

   ht = textheight("W");

   /*  select the off screen page for drawing */

   setactivepage(1);

   /* draw a line on page #1 */

   line(0, 0, getmaxx(), getmaxy());

   /* output a message on page #1 */

   settextjustify(CENTER_TEXT, CENTER_TEXT);

   outtextxy(x, y, "This is page #1:");

   outtextxy(x, y+ht, "Press any key to halt:");

   /* select drawing to page #0 */

   setactivepage(0);

   /* output a message  on page #0 */

   outtextxy(x, y, "This is page #0.");

   outtextxy(x, y+ht, "Press any key to view page #1:");

   getch();

   /* select page #1 as the visible page */

   setvisualpage(1);

   /* clean up */

   getch();

   closegraph();

   return 0;

}

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