Write a C Program to perform Moving Wheel using graphics

Below is the source code for C Program to perform Moving Wheel using graphics which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE : :

/*  C Program to perform Moving Wheel using graphics  */

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<math.h>
#include<dos.h>
int l = 1;
void ddaline(int x1, int y1, int x2, int y2) {
        int s, dx, dy, m;
        float xi, yi, x, y;
        dx = x2 - x1;
        dy = y2 - y1;
        if (abs(dx) > abs(dy))
                s = abs(dx); else
                s = abs(dy);
        xi = dx / (float) s;
        yi = dy / (float) s;
        x = x1;
        y = y1;
        putpixel(x1 + 0.5, y1 + 0.5, 15);
        for (m = 0; m < s; m++) {
                x += xi;
                y += yi;
                putpixel(x + 0.5, y + 0.5, 15);
        }
}
void plotpoints1(int x, int y, int cx, int cy) {
        putpixel(cx + x, cy + y, 15);
        putpixel(cx - x, cy - y, 15);
        putpixel(cx - y, cy + x, 15);
        putpixel(cx + y, cy - x, 15);
        if (l % 20 == 0) {
                ddaline(cx - x, cy - y, cx + x, cy + y);
                ddaline(cx - y, cy + x, cx + y, cy - x);
        }
        l++;
}
void plotpoints2(int x, int y, int cx, int cy) {
        putpixel(cx - x, cy + y, 15);
        putpixel(cx + x, cy - y, 15);
        putpixel(cx + y, cy + x, 15);
        putpixel(cx - y, cy - x, 15);
        if (l % 20 == 0) {
                ddaline(cx + x, cy - y, cx - x, cy + y);
                ddaline(cx - y, cy - x, cx + y, cy + x);
        }
        l++;
}
void mcircle(int cx, int cy, int r) {
        int x = 0, y, p;
        y = r;
        p = 1 - r;
        while (x < y) {
                plotpoints1(x, y, cx, cy);
                x++;
                if (p < 0)
                            p += 2 * x + 1; else {
                        y--;
                        p += 2 * (x - y) + 1;
                }
        }
        x = y + 1;
        while (abs(x) > 0) {
                plotpoints2(x, y, cx, cy);
                x--;
                if (p >= 0)
                            p = p - 2 * x - 1; else {
                        y++;
                        p = p - 2 * (x - y) - 1;
                }
        }
}
void main() {
        int gd = DETECT, gm = DETECT;
        int i = 0;
        initgraph(&gd, &gm, "");
        while (!kbhit()) {
                if (i > 640)
                            i = -200;
                cleardevice();
                mcircle(100 + (i++), 200, 100);
                delay(90);
                i++;
        }
        getch();
}

Above is the source code for C Program to perform Moving Wheel using graphics which is successfully compiled and run on Windows System.The Output of the program is shown above .