Answered: Consider the following types and…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Consider the following types and functions

type ('q, 's) transition = 'q * 's option * 'q

type ('q, 's) nfa_t = { sigma : 's list; qs : 'q list; q0 : 'q; fs : 'q list; delta : ('q, 's) transition list; }

mo n ql t, of Type: ('q, 's) nfa_t -> 'q list -> 's option -> 'q list, takes an NFA n, a set of initial states ql, and a symbol option t. It returns a set of states that the NFA might be in after starting from any state in ql and making one transition on the symbol t.

e_clo n ql, of Type: ('q, 's) nfa_t -> 'q list -> 'q list, takes an NFA n and a set of initial states ql. It returns a set of states that the NFA might be in after making zero or more epsilon transitions from any state in ql.

Complete function

acce n t, of Type ('q, char) nfa_t -> string -> bool

which takes an NFA nfa and a string s, and returns true if the NFA accepts the string.

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