Write a program to rotate a wheel clockwise or anticlockwise as per user’s choice.

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

#include<math.h>

          

#define R 3.14/180

void drawline(int, int, int , int, int);

void main()

{

int gdriver=DETECT, gmode,i,d,ch,x,y,r;

initgraph(&gdriver,&gmode,"c:\\tc\\bgi");

cleardevice();

x=getmaxx()/2,    y=getmaxy()/2;

printf("Enter the Radius of the circle : ");

scanf("%d",&r);

printf("\n\n1.Clockwise -> Up-Arrow Key   \n2.Anticlockwise -> Down-Arrow Key");

printf("\n\nEnter the Direction of circle rotation : ");

ch = getch();

for(i=0 ; ; i++)

{

       if(kbhit())

       {

             ch = getch();

             if (ch == 72)

                   d = 1;

             else if (ch == 80)

                   d = -1;

             else if (ch == '\x1B')

                   exit(0);

       }

       drawline(x,y,r,d*i,15);

       circle(x,y,r);

       delay(300);

       drawline(x,y,r,d*i,0);

}

}

void drawline(int x, int y, int r, int a, int c)

{

setcolor(c);

line(x+r*cos(0*R+a),y+r*sin(0*R+x+r*cos(180*R+a),y+r*sin(180*R+a);

line(x+r*cos(45*R+a),y+r*sin(45*R+a),x+r*cos(225*R+a),y+r*sin(225*R+a);

line(x+r*cos(90*R+a), y+r*sin(90*R+a), x+r*cos(270*R+a),y+r*sin(270*R+a));

line(x+r*cos(135*R+a),y+r*sin(135*R+a),x+r*cos(315*R+a),y+r*sin(315*R+a));

}