JavaScript/JScript: Control Structures I - Pearson Learning Solutions

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2008934301 Chapter 14 JavaScript/JScript: Control Structures I 413 Fig. 14.7 Class-average program with counter-controlled repetition (part 3 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.
414 JavaScript/JScript: Control Structures I Chapter 14 Lines 9 through 13, var total, // sum of grades gradeCounter, // number of grades entered gradeValue, // grade value average, // average of all grades grade; // grade typed by user declare variables total, gradeCounter, gradeValue, average and grade. The variable grade will store the string the user types into the prompt dialog. The variable gradeValue will store the value of grade when its string representation that was returned from the prompt dialog is converted to an integer. Lines 16 and 17 total = 0; // clear total gradeCounter = 1; // prepare to loop are assignment statements that initialize total to 0 and gradeCounter to 1. Note that variables total and gradeCounter are initialized before they are used in a calculation. Uninitialized variables used in calculations result in logic errors and produce the value NaN (not a number). Common Programming Error 14.6 Not initializing a variable that will be used in a calculation results in a logic error. You must initialize the variable before it is used in a calculation. 14.6 Testing and Debugging Tip 14.1 Initialize variables that will be used in calculations. 14.6 Line 20 while ( gradeCounter
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