Microsoft Visual Basic Programs to Accompany Programming Logic and Design

219 Pages·2010·1.71 MB·English

by  Jo Ann Smith

SIXTH EDITION
M I C R O S O F T ® V I S U A L
B A S I C ® P R O G R A M S
T O A C C O M P A N Y
PROGRAMMING LOGIC
AND DESIGN
BY JO ANN SMITH
Australia • Brazil • Japan • Korea • Mexico • Singapore • Spain • United Kingdom • United States
Copyright 2010 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part.
Microsoft® Visual Basic® Programs to © 2011 Course Technology, Cengage Learning
Accompany Programming Logic and Design,
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Sixth Edition
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Jo Ann Smith
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ISBN-13: 978-0-538-74625-0
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Brief Contents
iii
Preface . . . . . . . . . . . . . . . . . xi
CHAPTER 1 An Introduction to Visual Basic and
the Visual Basic PPrrooggrraammmmiinngg EEnnvviirroonnmmeenntt .. .. 11
CHAPTER 2 Variables, Constants, Operators,
and Writing Programs Using Sequential
Statements . . . . . . . . . . . . . . . . 11
CHAPTER 3 Writing Structured Visual Basic Programs. . . 31
CHAPTER 4 Writing Programs that Make Decisions . . . . 46
CHAPTER 5 Writing Programs Using Loops . . . . . . . 74
CHAPTER 6 Using Arrays in Visual Basic Programs . . . . 96
CHAPTER 7 File Handling and Applications . . . . . . 112
CHAPTER 8 Advanced Array Techniques . . . . . . . . 127
CHAPTER 9 Advanced Modularization Techniques . . . . 144
CHAPTER 10 Creating a Graphical User Interface
(GUI) Using the Visual Studio Integrated
Development Environment (IDE) . . . . . . 169
Index . . . . . . . . . . . . . . . . . 193
Copyright 2010 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part.
Contents
iv
Preface . . . . . . . . . . . . . . . . . xi
CHAPTER 1 An Introduction to Visual Basic and
the Visual Basic PPrrooggrraammmmiinngg EEnnvviirroonnmmeenntt .. .. 11
The Visual Basic Programming Language . . . . . . . . . . 2
Three Types of Visual Basic Programs . . . . . . . . . . . . 2
An Introduction to Object-Oriented Terminology. . . . . . . . 3
The Structure of a Visual Basic Program. . . . . . . . . . . 5
The Visual Basic Development Cycle. . . . . . . . . . . . . 6
Writing Visual Basic Source Code . . . . . . . . . . . . . 7
Compiling a Visual Basic Program . . . . . . . . . . . . . 7
Executing a Visual Basic Program . . . . . . . . . . . . . 9
Exercise 1-1: Understanding How to Compile
and Execute Visual Basic Programs . . . . . . . . . . .10
Lab 1.1: Compiling and Executing a Visual
Basic Program . . . . . . . . . . . . . . . . . . . . .10
CHAPTER 2 Variables, Constants, Operators,
and Writing Programs Using Sequential
Statements . . . . . . . . . . . . . . . . 11
Variables . . . . . . . . . . . . . . . . . . . . . . . . .12
Variable Names . . . . . . . . . . . . . . . . . . . . .12
Visual Basic Data Types . . . . . . . . . . . . . . . . . .13
Exercise 2-1: Using Visual Basic Variables,
Data Types, and Keywords . . . . . . . . . . . . . . .14
Declaring and Initializing Variables. . . . . . . . . . . . . .14
Exercise 2-2: Declaring and Initializing Visual
Basic Variables. . . . . . . . . . . . . . . . . . . . .15
Lab 2.1: Declaring and Initializing Visual Basic Variables. . .16
Constants. . . . . . . . . . . . . . . . . . . . . . . . .17
Unnamed Constants . . . . . . . . . . . . . . . . . . .17
Named Constants . . . . . . . . . . . . . . . . . . . .17
Copyright 2010 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part.
CONTENTS
Exercise 2-3: Declaring and Initializing Visual
Basic Constants . . . . . . . . . . . . . . . . . . . .18
Lab 2.2: Declaring and Initializing Visual
Basic Constants . . . . . . . . . . . . . . . . . . . .18
Arithmetic and Assignment Operators . . . . . . . . . . . .19
Arithmetic Operators. . . . . . . . . . . . . . . . . . .19
v
Assignment Operators and the Assignment Statement. . . .20
Precedence and Associativity . . . . . . . . . . . . . . .21
Exercise 2-4: Understanding Operator Precedence
and Associativity . . . . . . . . . . . . . . . . . . . .22
Lab 2.3: Arithmetic and Assignment Operators . . . . . . .23
Sequential Statements, Comments, and Interactive Input
Statements . . . . . . . . . . . . . . . . . . . . . . .24
Exercise 2-5: Understanding Sequential Statements. . . . .28
Lab 2.4: Using Sequential Statements in a Visual
Basic Program . . . . . . . . . . . . . . . . . . . . .29
CHAPTER 3 Writing Structured Visual Basic Programs. . . 31
Using Flowcharts and Pseudocode to Write a Visual
Basic Program. . . . . . . . . . . . . . . . . . . . . .32
Lab 3.1: Using Flowcharts and Pseudocode
to Write a Visual Basic Program . . . . . . . . . . . . .36
Writing a Modular Program in Visual Basic . . . . . . . . . .38
Lab 3.2: Writing a Modular Program in Visual Basic . . . . .45
CHAPTER 4 Writing Programs that Make Decisions . . . . 46
Boolean Operators. . . . . . . . . . . . . . . . . . . . .47
Comparison Operators . . . . . . . . . . . . . . . . . .47
Logical Operators . . . . . . . . . . . . . . . . . . . .48
Comparison and Logical Operator Precedence
and Associativity . . . . . . . . . . . . . . . . . . . .49
Comparing Strings. . . . . . . . . . . . . . . . . . . . .52
Decision Statements. . . . . . . . . . . . . . . . . . . .53
The If Statement . . . . . . . . . . . . . . . . . . . .54
Exercise 4-1: Understanding If Statements . . . . . . . .55
Lab 4.1: Using If Statements . . . . . . . . . . . . . .56
The If Then Else Statement. . . . . . . . . . . . . .57
Exercise 4-2: Understanding If Then Else Statements. .58
Lab 4.2: Using If Then Else Statements . . . . . . . .60
Nested If Statements . . . . . . . . . . . . . . . . . .60
Exercise 4-3: Understanding Nested If Statements . . . .62
Lab 4.3: Using Nested If Statements . . . . . . . . . . .63
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CONTENTS
The Select Case Statement . . . . . . . . . . . . . .64
Exercise 4-4: Using a Select Case Statement. . . . . . . . . . . 67
Lab 4.4: Using a Select Case Statement . . . . . . . .67
Using Decision Statements to Make Multiple
Comparisons . . . . . . . . . . . . . . . . . . . . . .68
Using AND Logic. . . . . . . . . . . . . . . . . . . . .69
vi
Using OR Logic . . . . . . . . . . . . . . . . . . . . .69
Exercise 4-5: Making Multiple Comparisons
in Decision Statements . . . . . . . . . . . . . . . . .70
Lab 4.5: Making Multiple Comparisons
in Decision Statements . . . . . . . . . . . . . . . . .72
CHAPTER 5 Writing Programs Using Loops . . . . . . . 74
Writing a Do While Loop in Visual Basic . . . . . . . . . .75
Exercise 5-1: Using a Do While Loop . . . . . . . . . .76
Using a Counter to Control a Loop . . . . . . . . . . . . .77
Exercise 5-2: Using a Counter-Controlled Do While Loop . .78
Lab 5.1: Using a Counter-Controlled Do While Loop. . . .78
Using a Sentinel Value to Control a Loop. . . . . . . . . . .79
Exercise 5-3: Using a Sentinel Value to Control
a Do While Loop . . . . . . . . . . . . . . . . . . .81
Lab 5.2: Using a Sentinel Value to Control
a Do While Loop . . . . . . . . . . . . . . . . . . .81
Writing a For Loop in Visual Basic . . . . . . . . . . . . .82
Exercise 5-4: Using a For Loop. . . . . . . . . . . . . .84
Lab 5.3: Using a For Loop . . . . . . . . . . . . . . . .84
Writing a Do Until Loop in Visual Basic . . . . . . . . . .85
Exercise 5-5: Using a Do Until Loop . . . . . . . . . .86
Lab 5.4: Using a Do Until Loop. . . . . . . . . . . . .86
Nesting Loops. . . . . . . . . . . . . . . . . . . . . . .87
Exercise 5-6: Nesting Loops . . . . . . . . . . . . . . .88
Lab 5.5: Nesting Loops . . . . . . . . . . . . . . . . .88
Accumulating Totals in a Loop . . . . . . . . . . . . . . .89
Exercise 5-7: Accumulating Totals in a Loop . . . . . . . .91
Lab 5.6: Accumulating Totals in a Loop . . . . . . . . . .92
Using a Loop to Validate Input . . . . . . . . . . . . . . .93
Exercise 5-8: Validating User Input . . . . . . . . . . . .94
Lab 5.7: Validating User Input. . . . . . . . . . . . . . .95
CHAPTER 6 Using Arrays in Visual Basic Programs . . . . 96
Array Basics . . . . . . . . . . . . . . . . . . . . . . .97
Declaring Arrays. . . . . . . . . . . . . . . . . . . . .97
Initializing Arrays . . . . . . . . . . . . . . . . . . . .98
Copyright 2010 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part.
CONTENTS
Accessing Array Elements . . . . . . . . . . . . . . . .99
Staying Within the Bounds of an Array . . . . . . . . . . .99
Using Constants with Arrays . . . . . . . . . . . . . . 100
Exercise 6-1: Array Basics . . . . . . . . . . . . . . . 101
Lab 6.1: Using Arrays . . . . . . . . . . . . . . . . . 102
Searching an Array for an Exact Match . . . . . . . . . . 102
vii
Exercise 6-2: Searching an Array for an Exact Match . . . 105
Lab 6.2: Searching an Array for an Exact Match . . . . . 106
Parallel Arrays. . . . . . . . . . . . . . . . . . . . . . 107
Exercise 6-3: Parallel Arrays . . . . . . . . . . . . . . 110
Lab 6.3: Parallel Arrays . . . . . . . . . . . . . . . . 111
CHAPTER 7 File Handling and Applications . . . . . . 112
File Handling . . . . . . . . . . . . . . . . . . . . . . 113
Opening a File for Reading . . . . . . . . . . . . . . . 113
Reading Data from an Input File . . . . . . . . . . . . . 114
Reading Data Using a Loop and EOF. . . . . . . . . . . 114
Opening a File for Writing. . . . . . . . . . . . . . . . 115
Writing Data to an Output File . . . . . . . . . . . . . . 115
Exercise 7-1: Opening Files and Performing File Input . . . 117
Lab 7.1: Using an Input File. . . . . . . . . . . . . . . 118
Understanding Sequential Files and Control Break Logic. . . 119
Exercise 7-2: Accumulating Totals in Single-Level
Control Break Programs . . . . . . . . . . . . . . . 124
Lab 7.2: Accumulating Totals in Single-Level
Control Break Programs . . . . . . . . . . . . . . . 125
CHAPTER 8 Advanced Array Techniques . . . . . . . . 127
Sorting Data . . . . . . . . . . . . . . . . . . . . . . 128
Swapping Data Values . . . . . . . . . . . . . . . . . . 129
Exercise 8-1: Swapping Values . . . . . . . . . . . . . 129
Lab 8.1: Swapping Values . . . . . . . . . . . . . . . 130
Using a Bubble Sort . . . . . . . . . . . . . . . . . . . 130
The Main() Procedure . . . . . . . . . . . . . . . . 134
The fillArray() Procedure . . . . . . . . . . . . . 135
The sortArray() Procedure . . . . . . . . . . . . . 136
The displayArray() Procedure . . . . . . . . . . . 137
Exercise 8-2: Using a Bubble Sort. . . . . . . . . . . . 137
Lab 8.2: Using a Bubble Sort . . . . . . . . . . . . . . 138
Using Multidimensional Arrays . . . . . . . . . . . . . . 139
Exercise 8-3: Using Multidimensional Arrays . . . . . . . 142
Lab 8.3: Using Multidimensional Arrays . . . . . . . . . 142
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CONTENTS
CHAPTER 9 Advanced Modularization Techniques . . . . 144
Writing Procedures with No Parameters . . . . . . . . . . 145
Exercise 9-1: Writing Procedures with No Parameters . . . 147
Lab 9.1: Writing Procedures with No Parameters . . . . . 148
Writing Procedures that Require a Single Parameter . . . . 148
viii Exercise 9-2: Writing Procedures that Require
a Single Parameter. . . . . . . . . . . . . . . . . . 151
Lab 9.2: Writing Procedures that Require a Single
Parameter . . . . . . . . . . . . . . . . . . . . . . 152
Writing Procedures that Require Multiple Parameters . . . . 152
Exercise 9-3: Writing Procedures that Require
Multiple Parameters . . . . . . . . . . . . . . . . . 154
Lab 9.3: Writing Procedures that Require
Multiple Parameters . . . . . . . . . . . . . . . . . 155
Writing Functions that Return a Value . . . . . . . . . . . 156
Exercise 9-4: Writing Functions that Return a Value . . . . 158
Lab 9.4: Writing Functions that Return a Value . . . . . . 159
Passing an Array and an Array Element to a Procedure
or Function . . . . . . . . . . . . . . . . . . . . . . 160
Exercise 9-5: Passing Arrays to Procedures
and Functions . . . . . . . . . . . . . . . . . . . . 163
Lab 9.5: Passing Arrays to Procedures and Functions. . . 164
Using Visual Basic’s Built-In Functions . . . . . . . . . . . 165
Exercise 9-6: Using Visual Basic’s Built-In Functions. . . . 167
Lab 9.6: Using Visual Basic’s Built-In Functions . . . . . . 167
CHAPTER 10 Creating a Graphical User Interface (GUI)
Using the Visual Studio Integrated
Development Environment (IDE) . . . . . . 169
Graphical User Interface Programs . . . . . . . . . . . . 170
The Visual Studio Integrated Development Environment . . . 170
Components of a Visual Basic Solution. . . . . . . . . . . 172
The Solution Folder . . . . . . . . . . . . . . . . . . 172
The Designer Window . . . . . . . . . . . . . . . . . 173
The Code Window . . . . . . . . . . . . . . . . . . . 174
Design-Time and Run-Time Operating Modes . . . . . . . . 175
Creating a Visual Basic IDE Program. . . . . . . . . . . . 176
Designing the Form for the Doubler Program . . . . . . . 177
Writing the Code for the Doubler Program . . . . . . . . 180
Exercise 10-1: Elements of a GUI in Microsoft
Visual Studio. . . . . . . . . . . . . . . . . . . . . 181
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CONTENTS
Lab 10.1: Creating a Visual Basic GUI Program
in Microsoft Visual Studio . . . . . . . . . . . . . . . 182
A Programmer-Defined Class . . . . . . . . . . . . . . . 182
Creating a Programmer-Defined Class . . . . . . . . . . 183
Adding Properties to a Class . . . . . . . . . . . . . . 185
Adding Methods to a Class . . . . . . . . . . . . . . . 186
ix
Exercise 10-2: Creating a Class in Visual Basic . . . . . . 189
Lab 10.2: Creating a Class in Visual Basic . . . . . . . . 190
Index . . . . . . . . . . . . . . . . . 193
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