JavaScript/JScript: Control Structures I - Pearson Learning Solutions

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Chapter 14 JavaScript/JScript: Control Structures I 419
Good Programming Practice 14.7
When converting a pseudocode program to JavaScript, keep the pseudocode in the Java-
Script program as comments. 14.7
Software Engineering Observation 14.10
Experience has shown that the most difficult part of solving a problem on a computer is developing
the algorithm for the solution. After a correct algorithm has been specified, the process
of producing a working JavaScript program from the algorithm is normally
straightforward. 14.10
Software Engineering Observation 14.11
Many experienced programmers write programs without ever using program development
tools like pseudocode. These programmers feel that their ultimate goal is to solve the problem
on a computer, and that writing pseudocode merely delays the production of final outputs.
Although this may work for simple and familiar problems, it can lead to serious errors
on large, complex projects. 14.11
The JavaScript program and a sample execution are shown in Fig. 14.9. Although each
grade is an integer, the averaging calculation is likely to produce a number with a decimal
point (a real number).
1
2
3
4
5
6 Class Average Program:
7 Sentinel-controlled Repetition
8
9
10 var gradeCounter, // number of grades entered
11 gradeValue, // grade value
12 total, // sum of grades
13 average, // average of all grades
14 grade; // grade typed by user
15
16 // Initialization phase
17 total = 0; // clear total
18 gradeCounter = 0; // prepare to loop
19
20 // Processing phase
21 // prompt for input and read grade from user
22 grade = window.prompt(
23 "Enter Integer Grade, -1 to Quit:", "0" );
24
25 // convert grade from a String to an integer
26 gradeValue = parseInt( grade );
27
Fig. 14.9 Class-average program with sentinel-controlled repetition (part 1 of 3).
e-Business and e-Commerce: How to Program, by Harvey M. Deitel, Paul J. Deitel, and Tem R. Nieto. Published by Prentice Hall.
Copyright © 2001 by Pearson Education, Inc.