Computer Programming Concepts and Visual Basic David I. Schneider

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126 Computer Programming Concepts and Visual Basic the TaxSingle function, will be properly treated as part of the higher salary range. SUMMARY 1. The relational operators are , =, , =. 2. The principal logical operators are And, Or, and Not. 3. A condition is an expression involving constants, variables, functions, and operators (arithmetic, relational, and/or logical) that can be evaluated as either True or False. 4. An If block decides what action to take depending on the truth values of one or more conditions. To allow several courses of action, the If and Else parts of an If statement can contain other If statements. 5. A Select Case block selects one of several actions depending on the value of an expression, called the selector. The entries in the value lists should have the same type (string or numeric) as the selector. PROGRAMMING PROJECTS 1. Table 4.8 gives the price schedule for Eddie’s Equipment Rental. Full-day rentals cost one-and-a-half times half-day rentals. Write a program that displays Table 4.8 in a picture box when an appropriate command button is clicked and displays a bill in another picture box based on the item number and time period chosen by a customer. The bill should include a $30.00 deposit. TABLE 4.8 Price Schedule for Eddie’s Equipment Rental Piece of Equipment Half-Day Full Day 1. Rug cleaner $16.00 $24.00 2. Lawn mower $12.00 $18.00 3. Paint sprayer $20.00 $30.00 A possible form layout and sample run is shown in Figure 4-7. FIGURE 4-7 Form Layout and Sample Run for Programming Project 1 2. The American Heart Association suggests that at most 30 percent of the calories in our diet come from fat. Although food labels give the number of calories and amount of fat per serving, they often do not give the percentage of calories from fat. This percentage can be calculated by multiplying the number of grams of fat in one serving by 9, dividing that number by the total number of calories per serving, and multiplying the result by 100. Write a program that requests the name, number of calories per serving, and the grams of fat per serving as input,
and tells us whether the food meets the American Heart Association recommendation. A sample run is as follows: 3. Table 4.9 gives the 1998 federal income tax rate schedule for single taxpayers. Write a program that requests the taxable income and calculates the federal income tax. Use a Sub procedure for the input and a Function procedure to calculate the tax. TABLE 4.9 1998 Federal Income Tax Rates for Single Taxpayers Taxable Income Over But Not Over Your Tax Is Of Amount Over $0 $25,350 15% $0 $25,350 $61,400 $3,802.50 + 28% $25,350 $61,400 $128,100 $13,896.50 + 31% $61,400 $128,100 $278,450 $34,573.50 + 36% $128,100 $278,450 $86,699.50 + 39.6% $278,450 4. Write a program to determine the real roots of the quadratic equation ax + bx + c = 0 (where a ≠ 0) after requesting the values of a, b, and c. Use a sub procedure to ensure that a is nonzero. Note: The equation has 2, 1, or 0 solutions depending on whether the value of b ^2 – 4 * a * c is positive, zero, or negative. In the first two cases, the solutions are given by the quadratic formula (–b ± Sqr(b^2 – 4 * a * c)) / (2 * a). (Test the program with the following sets of coefficients.) a = 1 b = –11 c = 28 Solutions are 4 and 7. a = 1 b = –6 c = 9 Solution is 3. a = 1 b = 4 c = 1 No solution. 5. Table 4.10 contains seven proverbs and their truth values. Write a program that presents these proverbs one at a time and asks the user to evaluate them as true or false. The program should then tell the user how many questions were answered correctly and display one of the following evaluations: Perfect (all correct), Excellent (5 or 6 correct), You might consider taking Psychology 101 (less than 5 correct). TABLE 4.10 Seven Proverbs Proverb Truth Value The squeaky wheel gets the grease. True Cry and you cry alone. True Opposites attract. False Spare the rod and spoil the child. False Actions speak louder than words. True Familiarity breeds contempt. False Marry in haste, repent at leisure. True Source: “You Know What They Say . . .,” by Alfie Kohn, Psychology Today, April 1988. Programming Projects 127
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Computer Programming Concepts and V
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CONTENTS SECTION 1: PROBLEM SOLVING
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13.3 WEB PAGE PROGRAMMING WITH VBSC
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S E C T I O N 1 PROBLEM SOLVING
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4 Computer Programming Concepts and
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10 Computer Programming Concepts an
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S E C T I O N 2 FUNDAMENTALS OF PRO
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3.1 SUB PROCEDURES, PART I Structur
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Page 93 and 94: ■ FORM-LEVEL VARIABLES Visual Bas
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Page 115 and 116: SOLUTION: In the following program,
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Page 119 and 120: picTax.Cls picTax.Print “Your FIC
Page 121 and 122: Case 4, 5 picOutcome.Print “You a
Page 123 and 124: EXAMPLE 3 The following program use
Page 125 and 126: Case Else picResult.Print “The st
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Page 137: S E C T I O N 5 REPETITION
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Page 167: S E C T I O N 6 ARRAYS
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176 Computer Programming Concepts a
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S E C T I O N 7 SEQUENTIAL FILES
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S E C T I O N 8 RANDOM-ACCESS FILES
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S E C T I O N 9 THE GRAPHICAL DISPL
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10.1 LIST BOXES AND COMBO BOXES The
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Private Sub cmdAdd_Click() Dim item
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either typing in information or jus
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Private Sub cmdDisplay_Click() picF
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clicks on the square to toggle betw
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circle and the button is said to be
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hsbBar.Value changes accordingly. T
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THE SHAPE CONTROL The shape control
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FIGURE 10-9 A Picture Created with
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Rows 9 ScrollBars 0 - flexScrollBar
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Private Sub cmdQuit_Click() End End
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Here, the menu bar contains two men
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Clipboard.Clear deletes the content
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cedures that are available to all f
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The Flags property influences certa
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13. Additional forms serve as new w
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6. Voting Machine. The members of t
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11.1 AN INTRODUCTION TO DATABASES T
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9. Click on the down arrow to the r
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clicked or a Move, Update, Delete,
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Do While (Not foundFlag) And (Not d
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mary key. Databases of student enro
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question mark stands for a single c
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1995 populations. When the second c
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If a Find method does not locate a
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place an x in the check box next to
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population (in descending order). W
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Creating and Designing Databases 34
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9. When all fields have been specif
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Creating and Designing Databases 34
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TABLE 11.5(B) TABLE 11.5(C) course
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(a) Update the quantity field of th
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12.1 CLASSES AND OBJECTS noun A wor
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Task Statement Assign a value to a
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EXAMPLE 1 and then an instance of t
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[Run, enter the data for a student
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SOLUTION: Object Property Setting f
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4. Methods can be either Function o
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‘Student Class (CStudent) Private
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txtFinal.Text = “” picGrades.Pr
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■ EVENTS In the previous section
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frmCircles.ForeColor = vbRed ‘Mak
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Public Function X() As Integer X =
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End Sub Private Sub cmdDropBomb_Cli
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Next i End Sub Public Function Read
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Remove method. The number of object
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S E C T I O N 13 COMMUNICATING WITH
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A P P E N D I C E S
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APPENDIX C VISUAL BASIC STATEMENTS,
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CANCEL The Cancel property provides
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COLS and ROWS The Cols and Rows pro
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DEFINT, DEFLNG, DEFSNG, DEFDBL, DEF
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ENVIRON Visual Basic has an environ
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FONT.ITALIC or FONTITALIC These pro
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yields “1234.”, Format(1234000,
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the length of the string currently
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ISNUMERIC The value of the function
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Unlock statement is used to remove
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Focus Default Default Number First
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OR (Logical Operator) The logical e
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the same as in the original Dimensi
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SECOND The function Second extracts
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STRETCH When the Stretch property o
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UNLOCK The Unlock command is intend
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[COLOR]: Numbers written in base 16
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Appendix D 457
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466 Technology of the Internet D Da
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468 Technology of the Internet Rela
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470 Technology of the Internet 2. D
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SYSTEM REQUIREMENTS CD-ROM INSTRUCT
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Computer Programming Concepts and Visual Basic David I. Schneider

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