Computer Programming Concepts and Visual Basic David I. Schneider

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154 Computer Programming Concepts and Visual Basic file and produce a report in the form of the sample run shown in Figure 5-11. Employees should be paid time-and-a-half for hours in excess of 40. Payroll Report for Week ending 4/15/99 Employee Hourly Rate Hours Worked Gross Pay Al Adams $6.50 38 $247.00 Bob Brown $5.70 50 $313.50 Carol Coe $7.00 40 $280.00 FinalTotal $840.50 FIGURE 5-11 Sample Output from Programming Project 1 2. Table 5.3 shows the standard prices for items in a department store. Suppose prices will be reduced for the annual George Washington’s Birthday Sale. The new price will be computed by reducing the old price by 10 percent, rounding up to the nearest dollar, and subtracting 1 cent. If the new price is greater than the old price, the old price is used as the sale price. Write a program to display in a picture box the output shown in Figure 5-12. TABLE 5.3 Washington’s Birthday Sale Sale Item Original Price Item Price GumShoes 39.00 GumShoes 35.99 SnugFoot Sandals 21.00 SnugFoot Sandals 18.99 T-Shirt 7.75 T-Shirt 6.99 Maine Handbag 33.00 Maine Handbag 29.99 Maple Syrup 6.75 Maple Syrup 6.75 Flaked Vest 24.00 Flaked Vest 21.99 Nightshirt 26.00 Nightshirt 23.99 FIGURE 5-12 Output of Project 2 3. The Rule of 72 is used to make a quick estimate of the time required for prices to double due to inflation. If the inflation rate is r percent, then the Rule of 72 estimates that prices will double in 72/r years. For instance, at an inflation rate of 6 percent, prices double in about 72/6 or 12 years. Write a program to test the accuracy of this rule. The program should display a table showing, for each value of r from 1 to 20, the rounded value of 72/r and the actual number of years required for prices to double at an r percent inflation rate. (Assume prices increase at the end of each year.) Figure 5-13 shows the first few rows of the output. FIGURE 5-13 Rule of 72 Interest Rule Rate (%) of 72 Actual 1 72 70 2 36 36 3 24 24 4. Table 5.4 shows the number of bachelor degrees conferred in 1980 and 1994 in certain fields of study. Tables 5.5 and 5.6 show the percentage change and a his-
togram of 1994 levels, respectively. Write a program that allows the user to display any one of these tables as an option and quit as a fourth option. TABLE 5.4 Bachelor Degrees Conferred in Certain Fields Field of Study 1980 1994 Business and management 185,361 246,654 Computer and info. science 11,154 24,200 Education 118,169 167,600 Engineering 68,893 62,220 Social sciences 103,519 133,680 Source: U.S. National Center of Educational Statistics TABLE 5.5 Percentage Change in Bachelor Degrees Conferred Field of Study % Change (1980–1994) Business and management 33.1 Computer and info. science 117.0 Education 41.8 Engineering –9.7 Social sciences 29.1 TABLE 5.6 Bachelor Degrees Conferred in 1994 in Certain Fields Business and management ************************* 246,654 Computer and info. science *** 24,200 Education ***************** 167,600 Engineering ****** 62,220 Social sciences ************* 133,680 5. Least-Squares Approximation. Table 5.7 shows the 1988 price of a gallon of fuel and the consumption of motor fuel for several countries. Figure 5-14 displays the data as points in the xy plane. For instance, the point with coordinates (1, 1400) corresponds to the USA. Figure 5-14 also shows the straight line that best fits these data in the least squares sense. (The sum of the squares of the distances of the 11 points from this line is as small as possible.) In general, if (xi, y1), (x2, y2), . . , (xn, yn) are n points in the xy coordinate system, then the least squares approximation to these points is the line y = mx + b, where and m = n * (sum of xi * yi) – (sum of xi) * *=(sum of yi) �� n * (sum of xi * xi) – (sum of xi) 2 b = ((sum of yi) – m * (sum of xi))/n Write a program that calculates and displays the equation of the least squares line, and then allows the user to enter a fuel price and uses the equation of the line to predict the corresponding consumption of motor fuel. (Place the numeric data from the table in a data file.) A sample run is shown in Figure 5-15. Programming Projects 155
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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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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 133 and 134: Private Function TaxMarried(adjPay
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204 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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