A game made in computer lab that works in Turbo C++

game.cpp

/**
A game made in computer lab that works in Turbo C++
**/
#include <graphics.h>
#include <conio.h>
#include <dos.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int sign(int t) {
    if(t>0) return 1;
    else return -1;
}

int main()
{
    int gd = DETECT, gm;
    initgraph(&gd, &gm, "C:\\TURBOC3\\BGI");
    int hiscore = 0;
    start:
    // speed of cart
    int speed = 250;
    // redraw every del milliseconds
    int del = 20;
    int adjspeed = speed/del;
    int orspeed = adjspeed;
    int X_MAX = 640;
    int Y_MAX = 500;
    int GROUND = 360;
    int points [] = {30,330,30,360,70,360,90,350,90,330};
    int el1x,el2x;
    int bx1,bx2;
    int ex,ey;
    int es;
    int score,lives;
    score = 0;
    lives = 3;
    int espeed = adjspeed;
    ey = -es;
    double sp = 1;
    double dlsp = 0.0003;
    char sc[15] = "Score: ";
    char hs[23] = "High score: ";
    char lv[9] = "Lives: ";
    char name[30] = "<insert name here>";
    char credit[25] = "A game by Rishi Raj";
    char help[45] = "Press a and d to steer your trolley";
    el1x = 40; el2x = 62;
    bx1 = 90;bx2 = 120;
    ex = rand() % (X_MAX - 2*(bx2 - bx1))+ (bx2-bx1)/2;
    es = 5;
    ey = -es;
    if(hiscore == 0) {
    cleardevice();
    settextstyle(8,0,3);
    outtextxy(180,60,name);
    settextstyle(0,0,1);
    outtextxy(230,120,credit);
    outtextxy(160,300,help);
    while(!kbhit()){
    }
    }
    while(1) {
	sp+= dlsp;
	adjspeed= orspeed*sign(adjspeed);
	adjspeed *= sp;
	if(kbhit()) {
	 char ch = getch();
	 if(ch == 'd') adjspeed = adjspeed > 0 ? adjspeed : -adjspeed;
	 else if(ch == 'a') adjspeed = adjspeed > 0 ? -adjspeed : adjspeed;
	 else if(ch == 'x') return 0;
	}
	cleardevice();
	setcolor(WHITE);
	if(points[0] + adjspeed < 0 || bx2 + adjspeed > X_MAX) adjspeed =-adjspeed;
	for(int j = 0; j < 5; j++) {
		points[j*2] += adjspeed;
	}
	espeed = abs(adjspeed)*4/7;
	el1x += adjspeed;
	el2x += adjspeed;
	bx1 += adjspeed;
	bx2 += adjspeed;
	setfillstyle(SOLID_FILL,WHITE);
	bar(0,0,X_MAX+1,0);
	bar(0,0,0,GROUND+16);
	bar(X_MAX-1,0,X_MAX+1,GROUND+16);
	bar(0,GROUND+16,X_MAX+1,GROUND+16);
	setfillstyle(SOLID_FILL,RED);
	fillpoly(5,points);
	setfillstyle(SOLID_FILL,BLUE);
	fillellipse(el1x,368,8,8);
	fillellipse(el2x,368,8,8);
	setfillstyle(SOLID_FILL,GREEN);
	ey += espeed;
	if(ey <= 360 && ey >= 330) {
	  if(ex >= points[0] && ex <= points[8]) {
	    ey = -es;
	    ex = rand() % (X_MAX - 2*(bx2-bx1));
	    score++;
	  }
	}
	else if(ey > GROUND+2*es) {
	  lives--;
	  ey = -es;
	  ex = rand() % (X_MAX-3*(bx2-bx1)) + (bx2-bx1);
	}
	sprintf(&sc[7],"%d",score);
	sprintf(&hs[12],"%d",hiscore);
	sprintf(&lv[7],"%d",lives);
	outtextxy(10,10,sc);
	outtextxy(200,(GROUND+Y_MAX)/2,hs);
	outtextxy(350,10,lv);
	fillellipse(ex,ey,es,es);
	setfillstyle(SOLID_FILL,BROWN);
	bar(bx1,332,bx2,336);
	if(lives == 0) break;
	delay(del);
    }
    setcolor(YELLOW);
    if(score > hiscore) {
    outtextxy(250,130,"Congrats!");
    hiscore = score;
    }
    setcolor(RED);
    outtextxy(160,200,"Press x to exit or r to restart");
    while(!kbhit()) {
	char ch = getch();
	if(ch == 'x') break;
	if(ch == 'r') goto start;
    }
    closegraph();
}