C++ Graphics program analog clock (Source Code)

  /*Program for analog CLock*/

  #include <stdio.h>
  #include <conio.h>
  #include <math.h>
  #include <string.h>
  #include <graphics.h>
  #include <time.h>
  #include <dos.h>

 void minSecPos(int xrad, int midx, int midy, int x[60], int y[60]) 
 {
  int i, j=45;
  for (i=360; i>=0; i=i-6)
  {
   x[j] = midx-(xrad*cos((i*3.14)/180));
   y[j--] = midy-(xrad*sin((i*3.14)/180));
   j = (j==-1)?59:j;
  }
  return;
 }

  void calcPoints(int radius, int midx, int midy, int x[12], int y[12])
 {
  int x1, y1;
  x[0] = midx, y[0] = midy-radius;
  x[6] = midx, y[6] = midy+radius;
  x[3] = midx+radius, y[3] = midy;
  x[9] = midx-radius, y[9] = midy;

  x1 = (int) ((radius/2)*sqrt(3));
  y1 = (radius/2);
  x[2] = midx+x1, y[2] = midy-y1;
  x[4] = midx+x1, y[4] = midy+y1;
  x[8] = midx-x1, y[8] = midy+y1;
  x[10] = midx-x1, y[10] = midy-y1;

  x1 = radius/2;
  y1 = (int) ((radius/2)*sqrt(3));
  x[1] = midx+x1, y[1] = midy-y1;
  x[5] = midx+x1, y[5] = midy+y1;
  x[7] = midx-x1, y[7] = midy+y1;
  x[11] = midx-x1, y[11] = midy-y1;
  return;
 }

 int main() {
   int gd=DETECT, gm, err, tmp;
   initgraph(&gd, &gm, "C:\\tc\\bgi");

int i, j, midx, midy, radius, hr, min, sec;
int x[12], y[12], minx[60], miny[60];
int hrx[12], hry[12], secx[60], secy[60];
int secx1, secy1;
char str[256];
time_t t1;
struct tm*data;

err = graphresult();

if (err != grOk)
{
printf("Graphics Error: %s",
grapherrormsg(err));
return 0;
}

midx = getmaxx()/2;
midy = getmaxy()/2;

radius = 200;

calcPoints(radius-30, midx, midy, x, y);
calcPoints(radius-90, midx, midy, hrx, hry);

minSecPos(radius-50, midx, midy, minx, miny);
minSecPos(radius-70, midx, midy, secx, secy);

while (!kbhit())
{
setlinestyle(SOLID_LINE, 1, 3);
settextstyle(GOTHIC_FONT, 0, 3);

circle(midx, midy, radius);

for (j=0; j<12; j++)
{
 if (j==0)
  {
   sprintf(str, "%d", 12);
    } else {
  sprintf(str, "%d", j);
  }
settextjustify(CENTER_TEXT, CENTER_TEXT);
moveto(x[j], y[j]);
outtext(str);
}

t1 = time(NULL);
data = localtime(&t1);

sec = data->tm_sec % 60;
line(midx, midy, 
[sec], secy[sec]);

min = data->tm_min % 60;
line(midx, midy, minx[min], miny[min]);

hr = data->tm_hour % 12;
line(midx, midy, hrx[hr], hry[hr]);
delay(1000);
cleardevice();
}

     getch();
     closegraph();
     return 0;
  }

  Output: