C#

Foothill wrote:

would this be a major endeavor or something relatively simple?

Brisingr Aerowing wrote:

Beware, the build process can be quite finicky at times, failing for no obvious reason

while (true)
{
    ...
    if (entry == 1)
    {
        ...
    }
    else if (entry == 2)
    {
    }
    else
    {
        ...
    }
    break;
}

public class User
    {
    private string name;
    private string hairColour;
    private DateTime dateOfBirth;
    public User(string name, string hairColour, int year, int month, int day)
        {
        this.name = name;
        this.hairColour = hairColour;
        dateOfBirth = new DateTime(year, month, day);
        }
    public int GetAge()
        {
        DateTime start = dateOfBirth;
        DateTime end = DateTime.Now.Date;
        int days = end.Day - start.Day;
        if (days < 0)
            {
            end = end.AddMonths(-1);
            days += DateTime.DaysInMonth(end.Year, end.Month);
            }
        int months = end.Month - start.Month;
        if (months < 0)
            {
            end = end.AddYears(-1);
            months += 12;
            }
        int years = end.Year - start.Year;
        return years;
        }
    public string GetDetails()
        {
        return string.Format("{0} ({1}) is now {2}", name, hairColour, GetAge());
        }
    }

User mike = new User("Mike Smith", "Blonde", 1990, 11, 14);
User joe = new User("Joe Ninety", "Mousey", 1983, 2, 1);

User mike = new User("Mike Smith", "Blonde", 1990, 11, 14);
User joe = new User("Joe Ninety", "Mousey", 1983, 2, 1);
Console.WriteLine(mike.GetDetails());
Console.WriteLine(joe.GetDetails());

Mike Smith (Blonde) is now 25
Joe Ninety (Mousey) is now 33

public static class AgeCalculationExtension
{
    public static int CalculateCurrentAge(this DateTime birthday)
    {
        return CalculateAgeAsOf(birthday, DateTime.Today);
    }

    public static int CalculateAgeAsOf(this DateTime birthday, DateTime appointedDate)
    {
        if (appointedDate < birthday)
            throw new ArgumentOutOfRangeException(nameof(appointedDate));

        int age = appointedDate.Year - birthday.Year;
        if (birthday > appointedDate.AddYears(-age))
            age--;
        return age;
    }
}

DateTime dateTime = new DateTime(1968, 2, 29);
int age = dateTime.CalculateAgeAsOf(new DateTime(1964, 2, 29));