C graphics program for analog clock

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<dos.h>
#include<math.h>
 
#define arg_sec M_PI/30
#define arg_hour M_PI/6
#define arg_min M_PI/360
void main()
{
int gd=DETECT,gm,sec=0,hour,min,x1=0,y1=0,x2=0,y2=0,x3=0,y3=0;
char *k[12]={"1","2","3","4","5","6","7","8","9","10","11","12"};
struct time t;
initgraph(&gd,&gm,"");
setcolor(YELLOW);
circle(300,200,200);
circle(300,200,180);
setfillstyle(1,RED);
floodfill(300,390,YELLOW);
settextstyle(DEFAULT_FONT,0,2);
//----------------------Constants----------------------//
 
int a,b;
for(int i=1;i<13;i++)
{
a=160*cos(arg_hour*i-M_PI_2);
b=160*sin(arg_hour*i-M_PI_2);
outtextxy(a+300,b+200,k[i-1]);
}
 
//----------------------Constants----------------------//
/*****************************************************
1-Good
2-Small
3-Watse
4-caligraphy
5-cursive
6-good
7-excellent
8-Good
9-Big
10-Double
****************************************************/
int dig_sec;
char Time_Dig[14];
while(!kbhit())
{
settextstyle(7,0,4);
outtextxy(264,100,"Satya");
settextstyle(7,0,1);
outtextxy(278,280,"Quartz");
setcolor(BLACK);
line(300,200,x1+300,y1+200);
line(300,200,x2+300,y2+200);
line(300,200,x3+300,y3+200);
gettime(&t);
if(sec!=t.ti_sec)
{
sound(5000);
delay(1);
nosound();
}
hour=t.ti_hour;
sec=t.ti_sec;
min=t.ti_min;
Time_Dig[0]=hour/10+48;
Time_Dig[1]=hour%10+48;
Time_Dig[2]=':';
Time_Dig[3]=min/10+48;
Time_Dig[4]=min%10+48;
Time_Dig[5]=':';
Time_Dig[6]=sec/10+48;
Time_Dig[7]=sec%10+48;
Time_Dig[8]='\0';
outtextxy(270,250,"ÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛÛ");
x1=150*cos(arg_sec*sec-M_PI_2)*0.98;
y1=150*sin(arg_sec*sec-M_PI_2)*0.98;
x2=150*cos(arg_sec*min-M_PI_2)*0.9;
y2=150*sin(arg_sec*min-M_PI_2)*0.9;
if(hour>12) hour-=12;
x3=150*cos(arg_hour*hour-M_PI_2+arg_min*min)*0.6;
y3=150*sin(arg_hour*hour-M_PI_2+arg_min*min)*0.6;
setcolor(YELLOW);
line(300,200,x1+300,y1+200);
setcolor(CYAN);
line(300,200,x2+300,y2+200);
setcolor(WHITE);
line(300,200,x3+300,y3+200);
setcolor(YELLOW);
outtextxy(270,250,Time_Dig);
delay(50);
 
}
 
getch();
closegraph();
restorecrtmode();
}