C Program to Display Analog Clock Showing Correct Time - Computer Graphics Program

This is a c program which reads the current time from system and shows an analog clock that shows correct time. The clock hand ticks and the three hands (hour hand, minute hand, second hand) are used to to show correct time. This real-time analog clock c program uses graphics.h library to display the clock and time.h library to get current time. The program output is as follows:

#include<stdio.h>
#include<graphics.h>
#include<math.h>
#include<time.h>

int hr,sec,min;

void drawClock(int xc,int yc)
{
int i,inr=70,outr=80;
int hdeg,mindeg,secdeg,x,y;
circle(xc,yc,outr);
setfillstyle(SOLID_FILL,WHITE);
fillellipse(xc,yc,2,2);
for(i=180;i>-360;i-=6)
{
if(i%5==0)
 fillellipse(xc+inr*sin(i*3.14f/180),yc+inr*cos(i*3.14f/180),2,2);
else
 fillellipse(xc+inr*sin(i*3.14f/180),yc+inr*cos(i*3.14f/180),1,1);
//draw hands
hdeg=hr*360/12+30*min/60;
mindeg=min*6;
secdeg=sec*6;
x=xc+40*sin(hdeg*3.14f/180);
y=yc-40*cos(hdeg*3.14f/180);
line(xc,yc,x,y);
x=xc+55*sin(mindeg*3.14f/180);
y=yc-55*cos(mindeg*3.14f/180);
line(xc,yc,x,y);
x=xc+65*sin(secdeg*3.14f/180);
y=yc-65*cos(secdeg*3.14f/180);
line(xc,yc,x,y);
}

}

void main()
{

time_t now;
struct tm *timeinfo;
int gd=DETECT,gm,midx,midy;
int tsec,tmin,thr;
initgraph(&gd,&gm,"..\\BGI\\");
midx=getmaxx()/2;
midy=getmaxy()/2;

time(&now);
timeinfo=localtime(&now);
hr=timeinfo->tm_hour;
min=timeinfo->tm_min;
sec=timeinfo->tm_sec;

while(!kbhit())
{
drawClock(midx,midy);
delay(995);
cleardevice();
tsec=(sec+1)%60;
tmin=(min+(tsec==0?1:0))%60;
thr=(hr+(tmin==0?1:0))%12;
hr=thr;
sec=tsec;
min=tmin;
}
}