protected override void Solve(out string answer)
{
Day currentDay = new Day(DayOfWeek.Monday);
DateObject currentDate = new DateObject(1900, Month.January, 1);
DateManipulator dateManipulator = new DateManipulator(currentDay, currentDate);
while (!dateManipulator.Equals(1901, Month.January, 1))
{
dateManipulator++;
}
int sundaysCount = 0;
while (!dateManipulator.Equals(2000, Month.December, 31))
{
dateManipulator++;
if (dateManipulator.IsSundayOnFirstDayOfTheMonth())
{
sundaysCount++;
}
}
answer = string.Format("The number of Sundays that fell on the first of the month during the twentieth century (1 Jan 1901 to 31 Dec 2000) is {0}.", sundaysCount);
}
public DateManipulator(Day dayOfWeek, DateObject date)
{
this.dayOfWeek = dayOfWeek;
this.currentDate = date;
}