<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div class="row">
<h2>Create your snippet's HTML, CSS and Javascript in the editor tabs</h2>
</div>
</div>
<!DOCTYPE html>
<html>
<body>
<h2>Cadastro de pessoas</h2>
<p id="demo"></p>
<script>
var cars = ["", "", "", "", ""];
cars[0] = prompt("Digite o carro", "Aqui");
cars[1] = prompt("Digite o carro", "Aqui");
cars[2] = prompt("Digite o carro", "Aqui");
cars[3] = prompt("Digite o carro", "Aqui");
cars[4] = prompt("Digite o carro", "Aqui");
document.getElementById("demo").innerHTML = cars;
</script>
</body>
</html>