Concepts Of Programming Languages
12th Edition
ISBN: 9780134997186
Author: Sebesta, Robert W.
Publisher: Pearson,
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Textbook Question
Chapter 3, Problem 1PS
The two mathematical models for language description are:
- Recognition
- Generation
These two mathematical models can define the syntax of
Recognition:
- It works on yes or no basis. In this method, a
mechanism called recognition device (R) is used that can read strings from the given alphabet. - This would indicate whether the input string is in language or not. That means, it will either accept the string or reject the string.
- Recognition device filters the correctly formed sentences from those that are incorrectly formed.
- In recognition, recognizer is used for syntax. analysis. Recognizer does not check for all possible strings but it simply check if the given programs are in the language or not.
- It checks the syntactical part of the program.
Generation:
- In this method, a device named generator is used to generate the sentences in a language.
- Whenever a generator is called, it generator a sentence which is unpredictable.
- When a string is to be checked if it is a correct or incorrect, first of all, it calls the generator to generate a correct sentence.
- Then, it compares the correct generated string with the input string.
- Hence, it determines the correction in string.
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Chapter 3 Solutions
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