Write a recursive descent recognizer pseudocode. The following is a set of requirements for this recognizer (parser):         - Ask the user for an input stream.         - Report "legal" or "errors found" (not both!).         - Assume the input stream is the token stream.         - Assume the input stream terminates with a $.         - Assume there is no white space.         - Use a form to collect input and return the output.         - Test your recognizer with illegal and legal strings.         - Give a brief description of this recognizer for the user on how to use and what method that it based on.

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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Write a recursive descent recognizer pseudocode.

The following is a set of requirements for this recognizer (parser):

        - Ask the user for an input stream.
        - Report "legal" or "errors found" (not both!).
        - Assume the input stream is the token stream.
        - Assume the input stream terminates with a $.
        - Assume there is no white space.
        - Use a form to collect input and return the output.
        - Test your recognizer with illegal and legal strings.
        - Give a brief description of this recognizer for the user on how to use and what method that it based on.

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