Preparing for Symbol Tables (7 marks)

Enhance your lex (or flex) program such that it can display all identifiers that are found after parsing an input ALLCOT program. In addition, for each of these identifiers, print

• its number of occurrences,
• the number of the line where it appears first.

Subsidiary question. Can you modify your lex (or flex) program such that it can detect identifiers that are used (or defined) before they are declared?