Question 19 Question text Two types of tokens that need to be identified by the Postfix Machine are operator and operand. -True -False

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
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Question 17

Question text

What are the instruction needed if the Postfix Machine program detect an operand?
-pop two items from stack
-the expression is evaluated pushed the result onto the stack
-push it onto a stack
-print the top item from stack
 

Question 18

Question text

Why input string of the Postfix Machine need to be split into tokens?

-Easier to split string into two sub strings

-To split string into many single characters

-To split string into a list of sub strings

-To hold many types of data

Question 19

Question text

Two types of tokens that need to be identified by the Postfix Machine are operator and operand.

-True

-False

Question 20

Question text

What instructions needed if the Infix-Postfix Converter program detect the token is an operator?

-Immediately output the token.

-Pop all stack symbols until a symbol of lower precedence or a right-associative symbol of equal precedence appears.

-Pop all stack symbols until a symbol of lower precedence appears.

-Pop all stack symbols.

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