What makes a pretest and posttest loop different? Why are statements in the body of a loop that are conditionally executed referred to as that? Why is proper initialization of the counter and accumulator variables so crucial? Why should a piece of software close a file after it has finished using it?

What makes a pretest and posttest loop different? Why are statements in the body of a loop that are conditionally executed referred to as that? Why is proper initialization of the counter and accumulator variables so crucial? Why should a piece of software close a file after it has finished using it?

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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What makes a pretest and posttest loop different? Why are statements in the body of a loop that are conditionally executed referred to as that? Why is proper initialization of the counter and accumulator variables so crucial? Why should a piece of software close a file after it has finished using it?
Summary In this lab, you write a while loop that uses a sentinel value to control a loop in a Python program. You also write the statements that make up the body of the loop. Each theater patron enters a value from 0 to 4 indicating the number of stars that the patron awards to the Guide’s featured movie of the week. The program executes continuously until the theater manager enters a negative number to quit. Instructions Make sure the file MovieGuide.py is selected and open. Write thewhile loop using a sentinel value to control the loop, and also write the statements that make up the body of the loop. Execute the program by clicking the Run button at the bottom of the screen. Input the following as star ratings: 0, 3, 4, 4, 1, 1, 2, -1 must be written with this code: """ MovieGuide.py This program allows each theater patron to enter a value from 0 to 4 indicating the number of stars that the patron awards to the Guide's featured movie of the week. The program executes…
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Explain pretest/posttest loops. Why are loop-body conditionally executed statements called that? Why is counter and accumulator initialization so crucial? Why close a file after program is done?