Answered: Compulsory Task Follow these steps: ●…

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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Compulsory Task Follow these steps: ● For this task, you are required to refactor the badly written program RPN.java. This program is a Reverse-Polish Notation calculator which uses a stack. A Reverse-Polish Notation calculator is a calculator that will calculate equations where the operator follows the operands. Therefore, instead of inputting an equation as “1 + 2”, a Reverse-Polish Notation calculator would take the following input “ 1 2 +”. A stack is a data structure in which items are added to the top of the stack and removed from the top of the stack. It is therefore known as a last-in, first-out (LIFO) data structure. Stack terminology: ○ Push — is an operation that adds an item to the top of a stack. ○ Pop — is an operation that removes an item from the top of a stack. The pseudocode for this program is: ○ Get an equation (e.g. 2 3 +) from the user as input. ○ Loop through the string value input by the user. ■ When you encounter a number (remember that numbers can include decimal points), add it to the stack (push). ■ When you encounter an operator (e.g. +, -, /, etc.), pop two numbers from the stack and perform the appropriate calculation. ○ Display the answer of the calculation to the user. ● For this task you are required to: ○ Troubleshoot and debug the code so that it runs correctly. ○ Fix the indentation and formatting of the code so that it adheres to the guidelines provided here. ○ Make sure that all the names of variables, classes, methods, etc. adhere to the guidelines provided here. ○ Refactor the code to improve the quality and readability of the code in other ways highlighted in this task. ○ Most students who have to resubmit this Task do so due to errors and styling issues. To help you discover errors and styling issues quicker (before submitting your Task), please install the linter, SonarLint, to your IDE or editor. Use SonarLint to identify problems and clear each one of them until there are no issues being flagged. By default, it’s configured to flag issues based on the best practices we’ve discussed in this review.

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Compulsory Task
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Follow these steps:
• For this task, you are required to refactor the badly written program
RPN.java. This program is a Reverse-Polish Notation calculator which
uses a stack.
A Reverse-Polish Notation calculator is a calculator that will calculate
equations where the operator follows the operands. Therefore, instead of
inputting an equation as "1+2", a Reverse-Polish Notation calculator
would take the following input *12+".
A stack is a data structure in which items are added to the
top of the stack and removed from the top of the stack. It is
therefore known as a last-in, first-out (LIFO) data structure.
Stack terminology.
o Push - is an operation that adds an item to the top
of a stack.
o Pop - is an operation that removes an item from the top of a stack.
The pseudocode for this program is:
o Get an equation (e.g. 23 +) from the user as input.
o
• For this task you are required to:
Loop through the string value input by the user.
■ When you encounter a number (remember that numbers
can include decimal points), add it to the stack (push).
■ When you encounter an operator (e.g. +, -, /, etc.), pop two
numbers from the stack and perform the appropriate
calculation.
o Display the answer of the calculation to the user.
o Troubleshoot and debug the code so that it runs correctly.
O
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14°C
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4)
19:11
11/30/2022
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