Enum Month

project_euler_problems/CountingSundays/solution.cpp:7–11

using enum here so that we can use descriptive month names instead of numbers 0, 1, ... 11 when accessing array of days per month

// month names instead of numbers 0, 1, ... 11 when
// accessing array of days per month
enum Month
{
    Jan, Feb, Mar, Apr, May,Jun,
    Jul, Aug, Sep, Oct, Nov, Dec
};

// lets us use descriptive names for day of the week
enum DayOfWeek