Write an equality operator (call it =/) that works correctly on the yearday type of Example XXXXXXXXXXYou may need to look up the rules that govern the occurrence of leap years.)  Create addition and...

Write an equality operator (call it =/) that works correctly on the yearday type of Example 11.38. (You may need to look up the rules that govern the occurrence of leap years.)  Create addition and subtraction functions for the celsius and fahrenheit temperature types introduced in Sidebar 11.3. To allow the two scales to be mixed, you should also define conversion functions ct_of_ft : fahrenheit_temp -> celsius_temp and ft_of_ct : celsius_temp -> fahrenheit_temp. Your conversions should round to the nearest degree (half degrees round up).