function showDetails() {
    var firstName = document.getElementById("firstNameBox").value;
    var lastName = document.getElementById("lastNameBox").value;
    var age = Number(document.getElementById("ageBox").value);
    var password = document.getElementById("passwordBox").value;
    console.log(`You entered: ${firstName}, ${lastName}, ${age}, ${password}`);
    document.getElementById("detailsLabel").innerHTML += `${firstName}, ${lastName}, ${age}, ${password}`;

    console.log(10 + 10);
    console.log(10 * 10);
    console.log(10 - 3);
    console.log(100 / 25);
    console.log(100 % 3);
}