Write a function definition for a function called before that takes two arguments of the type DayofYear, which is defined in Display \(11.1 .\) The function returns a bool value and returns true if the first argument represents a date that comes before the date represented by the second argument; otherwise, the function returns false. For example, January 5 comes before February 2

Begin by defining the function with the given name "before" and specifying that it takes two arguments of the type "DayofYear". In our example, we can call the arguments day1 and day2. ```cpp bool before(DayofYear day1, DayofYear day2) { // Function implementation } ```

In order to determine if one date comes before another, first, we need to compare the month values of each date. If the month of the first date (day1.month) is smaller than the month of the second date (day2.month), the function should return true (that day1 is before day2). If the first date's month is larger, return false. If their month values are equal, proceed to step 3. ```cpp bool before(DayofYear day1, DayofYear day2) { if (day1.month < day2.month) { return true; } else if (day1.month > day2.month) { return false; } // Continue to compare dates if month values are equal } ```

When the month values of both dates are equal, we need to compare the day values to determine their chronological order. If the first date's day value (day1.day) is smaller than the second date's day value (day2.day), return true (day1 is before day2). Otherwise, return false. ```cpp bool before(DayofYear day1, DayofYear day2) { if (day1.month < day2.month) { return true; } else if (day1.month > day2.month) { return false; } // Compare day values if month values are equal if (day1.day < day2.day) { return true; } else { return false; } } ``` Now the 'before' function is complete and will correctly compare two dates of the type DayofYear and determines if the first date comes before the second date.