Computer Programming Concepts and Visual Basic David I. Schneider

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156 Computer Programming Concepts and Visual Basic TABLE 5.7 A Comparison of 1988 Fuel Prices and Per Capita Motor Fuel Use Price per Tons of Oil Price per Tons of Oil gallon in per 1000 gallon in per 1000 Country U.S. Dollars Person Country U.S. Dollars Person USA $1.00 1400 France $3.10 580 W. Ger. $2.20 620 Norway $3.15 600 England $2.60 550 Japan $3.60 410 Austria $2.75 580 Denmark $3.70 570 Sweden $2.80 700 Italy $3.85 430 Holland $3.00 490 Source: World Resources Institute FIGURE 5-14 Least-Squares Fit to Data from Table 5.7 FIGURE 5-15 Sample Run of Programming Project 5 6. Write a program to provide information on the height of a ball thrown straight up into the air. The program should request the initial height, h feet, and the initial velocity, v feet per second, as input. The four options to be provided by command buttons are as follows: (a) Determine the maximum height of the ball. Note: The ball will reach its maximum height after v/32 seconds. (b) Determine approximately when the ball will hit the ground. Hint: Calculate the height after every .1 second and observe when the height is no longer a positive number. (c) Display a table showing the height of the ball every quarter second for 5 seconds or until it hits the ground. (d) Quit. The formula for the height of the ball after t seconds, h + v * t – 16 * t * t, should be specified in a user-defined function. (Test the program with v = 148 and h = 0. This velocity is approximately the top speed clocked for a ball thrown by a professional baseball pitcher.)
7. Depreciation to a Salvage Value of 0. For tax purposes an item may be depreciated over a period of several years, n. With the straight-line method of depreciation, each year the item depreciates by 1/nth of its original value. With the double-declining-balance method of depreciation, each year the item depreciates by 2/nths of its value at the beginning of that year. (In the last year it is depreciated by its value at the beginning of the year.) Write a program that (a) Requests a description of the item, the year of purchase, the cost of the item, the number of years to be depreciated (estimated life), and the method of depreciation. The method of depreciation should be chosen by clicking one of two command buttons. (b) Displays a depreciation schedule for the item similar to the schedule shown in Figure 5-16. Description: Computer Year of purchase: 1999 Cost: $2000.00 Estimated life: 5 Method of depreciation: double-declining-balance Value at Amount Deprec Total Depreciation Year Beg of Yr During Year to End of Year 1999 2,000.00 800.00 800.00 2000 1,200.00 480.00 1,280.00 2001 720.00 288.00 1,568.00 2002 432.00 172.80 1,740.80 2003 259.20 259.20 2,000.00 FIGURE 5-16 Depreciation Schedule 8. The Twelve Days of Christmas. Each year, Provident National Bank of Philadelphia publishes a Christmas price list. See Table 5.8. Write a program that requests an integer from 1 through 12 and then lists the gifts for that day along with that day’s cost. On the nth day, the n gifts are 1 partridge in a pear tree, 2 turtle doves, . . . n of the nth item. The program also should give the total cost of all twelve days. As an example, Figure 5-17 shows the output in the picture box when the user enters 3. TABLE 5.8 Christmas Price Index Item Cost Item Cost partridge in a pear tree 27.50 swan-a-swimming 1000.00 turtle dove 25.00 maid-a-milking 4.25 French hen 5.00 lady dancing 289.50 calling bird 70.00 lord-a-leaping 292.50 gold ring 60.00 piper piping 95.75 geese-a-laying 25.00 drummer drumming 95.00 The gifts for day 3 are 1 partridge in a pear tree 2 turtle doves 3 French hens Cost: $92.50 Total cost for the twelve days: $71,613.50 FIGURE 5-17 Sample Output for Programming Project 8 Programming Projects 157
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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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The second task performed by the ad
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‘The density (number of people pe
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"Hawaii", 1184000, 6471 "Alaska", 6
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dure by just using the variable in
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Call CalculateSum(x, y, s) Call Dis
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■ FORM-LEVEL VARIABLES Visual Bas
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3. In Appendix D, the section “St
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Private Sub cmdDetermine_Click() Di
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Private Sub cmdCompute_Click() Dim
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preceded with the word ByVal. Built
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It is clear from the hierarchy char
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The meaningful procedure names, alo
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FIGURE 3-9 Sample Run for Programmi
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4.1 RELATIONAL AND LOGICAL OPERATOR
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Page 121 and 122: Case 4, 5 picOutcome.Print “You a
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Page 125 and 126: Case Else picResult.Print “The st
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Page 133 and 134: Private Function TaxMarried(adjPay
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206 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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