C Graphics - Page Flipping

This is a simple code for page flipping in C. The problem is, it works on a friend's computer, but not on mine. We both use the Turbo C++ compiler v3.0. The problem is that if 'i' is set to 0 inside the 'while (!kbhit())' loop, the Page 0 comes up and doesn't go. If 'i' is set to 1, 2, or 3, that page comes for a very short time (less than 1 second), and then Page 0 comes back and stays on the screen. How can I fix this problem?

Code:

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#include <conio.h>
#include <dos.h>
#include <graphics.h>

int main(void)
 {
    int    i;

      /* request auto detection */
    int gdriver = EGA, gmode = EGALO, errorcode;

    /* initialize graphics and local
    variables */
    initgraph(&gdriver, &gmode, "..\\bgi");

    /* read result of initialization */
    errorcode = graphresult();
    /* an error occurred */
    if (errorcode != grOk)
      {
          printf("Graphics error: %s\n", grapherrormsg(errorcode));
          printf("Press any key to halt:");
          getch();
          exit(1);    /* terminate with an error code */
      }

    /* setting the four pages available in EGALO mode */
    setactivepage(0);
    cleardevice();
    circle(1, 1, 100);
    outtextxy(200, 1, "Page 0");

    setactivepage(1);
    cleardevice();
    circle(getmaxx(), 1, 100);
    outtextxy(200, 1, "Page 1");

    setactivepage(2);
    cleardevice();
    circle(getmaxx(), getmaxy(), 100);
    outtextxy(200, 1, "Page 2");

    setactivepage(3);
    cleardevice();
    circle(1, getmaxy(), 100);
    outtextxy(200, 1, "Page 3");

    /* looping through the pages */
    while (!kbhit())
      {
          i = 0;
          setvisualpage(i);
          ++i;
          if (i == 4)
              i = 0;
          delay(1000);
      }

    closegraph();

    return 0;
 }

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[code][/code]tagged by Salem

Quote:

---

/* looping through the pages */
while (!kbhit())
{
i = 0;
setvisualpage(i);
++i;
if (i == 4)
i = 0;
delay(1000);
}

}

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solution :

put the statement i=0 outside the loop.( before while)