<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>
<h2>Cadastro de aluno</h2>
<p id="demo"></p>
<script>
var aluno = ["","","","",""];
aluno[0]= prompt("Digite o aluno", "Aqui");
aluno[1]= prompt("Digite o aluno", "Aqui");
aluno[2]= prompt("Digite o aluno", "Aqui");
aluno[3]= prompt("Digite o aluno", "Aqui");
aluno[4]= prompt("Digite o aluno", "Aqui");
document.getElementById("demo").innerHTML = aluno;
</script>
</body>
</html>