Car Movement using c in graphics

C Program

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<dos.h>
int scan, ascii;
void getkey() {
	union REGS ii, oo;
	ii.h.ah = 0;
	int86(22, &ii, &oo);
	scan = oo.h.ah;
	ascii = oo.h.al;
}
void car(int x, int c) {
	setcolor(c);
	line(x + 150, 100, x + 242, 100);
	ellipse(x + 242, 105, 0, 90, 10, 5);
	line(x + 150, 100, x + 120, 150);
	line(x + 252, 105, x + 280, 150);
	line(x + 100, 150, x + 320, 150);
	line(x + 100, 150, x + 100, 200);
	line(x + 320, 150, x + 320, 200);
	line(x + 100, 200, x + 110, 200);
	line(x + 320, 200, x + 310, 200);
	arc(x + 130, 200, 0, 180, 20);
	arc(x + 290, 200, 0, 180, 20);
	line(x + 270, 200, x + 150, 200);
	circle(x + 130, 200, 17);
	circle(x + 290, 200, 17);
}
void main() {
	int gd = DETECT, gm = DETECT, i = 0, c = 1, prev = 80;
	initgraph(&gd, &gm, "");
	cleardevice();
	car(0, 15);
	while (!kbhit());
	while (1) {
		getkey();
		if (scan == 72) {
			c++;
			scan = prev;
		}
		if (scan == 80) {
			if (c != 1)
					c--;
			scan = prev;
		}
		if (ascii == 13)
			    break;
		if (scan == 77) {
			prev = 77;
			while (!kbhit()) {
				car(i, 0);
				i += c;
				car(i, 15);
				delay(20);
			}
		}
		if (scan == 75) {
			prev = 75;
			while (!kbhit()) {
				car(i, 0);
				i -= c;
				car(i, 15);
				delay(20);
			}
		}
		if (ascii == 32) {
			prev = 80;
			car(i, 15);
			while (!kbhit());
		}
	}
	getch();
}