Build an ad hoc scanner for the calculator language. As output, have it print a list, in order, of the input tokens. For simplicity, feel free to simply halt in the event of a lexical error. Write a...

Build an ad hoc scanner for the calculator language. As output, have it print a list, in order, of the input tokens. For simplicity, feel free to simply halt in the event of a lexical error. Write a program in your favorite scripting language to remove comments from programs in the calculator language (Example 40).