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62 Day 2 Listing 2.4. continued 75: } 76: void displayRecord(int num, mailingListRecord mlRec) 77: { 78: cout
NOTE Wading In Deeper The displayRecord() function, which begins on line 76, takes two parameters. The first parameter, num, is an int that contains the index number of the record to display. This variable is used only to display the record number. On line 78 I add 1 to num when I display it because users are accustomed to lists beginning with 1 rather than with 0. (I aim to please!) The second parameter of the displayRecord() function is an instance of the mailingListRecord structure. Inside the displayRecord() function I use the local instance of the structure passed in (which represents a copy of the structure) to display the contents of the structure. In this case I am passing the mailingListRecord structure by value. What this means is that a copy of the structure is created each time the displayRecord() function is called. This is not very efficient because of the overhead required to pass a structure by value. The overhead comes in the form of the extra time and memory required to make a copy of the structure each time the function is called. It would be better to pass the structure by reference, but I haven’t talked about that yet, because the structure is passed by value in this program. You will learn about passing by reference tomorrow when we discuss functions in C++. Note that the displayRecord() function is called from both the for loop when all the records are displayed (line 49) and again from the main body of the program to display the actual record chosen (line 72). That’s precisely why the code to display a record has been placed in a function. By putting it in a function, I only have to write the code once and can avoid duplicating the code unnecessarily. TIP Any time you find yourself repeating code more than a couple times in your programs, think about moving that code to a function. Then you can call the function when you need that code executed. There is another segment of this program that deserves mention. Look at this do-while loop, which begins on line 59: do { rec = getch(); rec -= 49; } while (rec < 0 || rec > 2); This code first gets a character from the keyboard using the getch() function. As you have 63 2
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At a Glance At A Glance WEEK 1 In W
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Day 1 Getting Your Feet Wet Week Ge
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Getting Your Feet Wet are divided i
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NOTE Getting Your Feet Wet As you m
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Getting Your Feet Wet but you need
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NOTE Totally Immersed: C++ Classes
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C++ Class Frameworks and the Visual
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Figure 5.1. The Object Inspector wi
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NOTE C++ Class Frameworks and the V
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Exercises C++ Class Frameworks and
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The C++Builder IDE Explored: Projec
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TIP Figure 6.11. The About box with
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Figure 6.18. The About box for the
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Figure 6.20. The Project Options di
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Quiz The C++Builder IDE Explored: P
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Working with the Form Designer and
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NOTE Working with the Form Designer
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NOTE TIP TIP Working with the Form
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NOTE Figure 7.10. The Alignment Pal
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Quiz Working with the Form Designer
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In Review In Review WEEK 1 You cove
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In Review displayed based on user i
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At a Glance At A Glance WEEK 2 Are
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Day 8 VCL Components VCL Components
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VCL Components C++Builder displays
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VCL Components Important Common Pro
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Cursors VCL Components The Cursor p
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Figure 8.2. The Object Inspector sh
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VCL Components You can set this pro
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VCL Components Method Description I
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VCL Components Similarly, when the
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NOTE TIP VCL Components There may b
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VCL Components or load the Memo wit
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VCL Components Item Applies To Desc
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VCL Components You can use owner-dr
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VCL Components Property Applies To
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VCL Components for buttons that are
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VCL Components property set to true
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VCL Components The GroupIndex Prope
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VCL Components As such, they go wit
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Day 9 Creating Applications in C++B
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Figure 9.1. The Object Repository w
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Creating Applications in C++Builder
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TIP Creating Applications in C++Bui
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Figure 9.4. The Object Repository c
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TIP Creating Applications in C++Bui
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Summary Creating Applications in C+
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More on Projects Day 10 More on Pro
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More on Projects The only time this
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TIP More on Projects You can add mo
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More on Projects Table 10.1. The Pr
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Figure 10.6. The Project Explorer s
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■ Forms ■ Application ■ C++
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NOTE TIP More on Projects To avoid
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More on Projects The Show warnings
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More on Projects The C++Builder Cod
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Figure 10.13. The Code Editor with
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Quiz More on Projects Q When I star
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More on Projects 8. Continuing with
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Using the Debugger Day 11 Using the
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Using the Debugger Item Shortcut De
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CPU View Using the Debugger The CPU
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Using the Debugger macros, TRACE an
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C++Builder Database Architecture Da
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Building Internet Applications Day
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Building Internet Applications Tabl
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Quiz Building Internet Applications
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C++Builder Extensions to C++ Day 14
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C++Builder Extensions to C++ compil
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C++Builder Extensions to C++ value
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In Review In Review WEEK 2 Wow, tha
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Answers to Quiz Questions APPENDIX
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Day 3 Day 4 Answers to Quiz Questio
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Day 10 Answers to Quiz Questions 1.
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Symbols & (ampersands), 246 © (cop
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C C (programming language), 132 C c
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File Save, 309-312 Find/Replace, 31
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Insert Template, 248 Object Reposit
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Cascade( ), 198 Close( ), 198 Close
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Layout property (BitBtn component),
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object-oriented programming, see OO
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protected member functions, 106 pro
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structures arrays, 58 C vs. C++, 64
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A V I A C O M S E R V I C E The Inf
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Component Palette Quick Reference S
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Add to Your Sams Library Today with
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Overview Introduction Introduction
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Introduction VCL Explored .........
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