Give an implementation of the macroinstruction searchleft (a, qi, qj), which indicates that the machine is to search its tape to the left of the current position for the first occurrence of the symbol a. If an a is encountered before a blank, the machine is to go into state qi, otherwise it is to go into state qj.

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
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Give an implementation of the macroinstruction

searchleft (a, qiqj),

which indicates that the machine is to search its tape to the left of the current position for the first occurrence of the symbol a. If an a is encountered before a blank, the machine is to go into state qi, otherwise it is to go into state qj.

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