Instructions

Lewis, a young Lisp Alien, needs to get some work done on their Human alphabets project and asks if you can help them program some functions they will need.

1. Comparing characters

Lewis will need a function to compare two characters, determining if the first is greater-than, less-than or equal-to the second. Write a function compare-chars which will take two characters and evaluate to :greater-than, :less-than, or :equal-to appropriately. The function should compare in a case-sensitive manner.

2. Determine the "size" of the character

Lewis needs to know the if a character is "big" (a uppercase character) or "little" (a lowercase character), or "no-size" if it is neither. Write a function size-of-char that will evaluate to :big, :small or :no-size depending upon the "size" of the character:

3. Changing the "size" of the character

Lewis may need to make a big character small, or a small character big. Write a function change-size-of-char which takes two parameters a character and a desired size (:big or :small). It should evaluate to the corresponding character of the correct size.

4. Determine the "type" of a character

Not only will Lewis need to know what the 'size' of the character is but also its 'type'. Write a function type-of-char that will evaluate to :alpha if the character is an alphabetic character, :numeric if it is a numeric character, :space if it is a space character, :newline if it is a newline character and :unknown otherwise