Computer Programming Concepts and Visual Basic David I. Schneider

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210 Computer Programming Concepts and Visual Basic FIGURE 6-13 Possible Outcome of Project 1 2. Statisticians use the concepts of mean and standard deviation to describe a collection of data. The mean is the average value of the items, and the standard deviation measures the spread or dispersal of the numbers about the mean. Formally, if x1, x2, x3, . . . , xn is a collection of data, then mean = m = (x1 standard deviation = s = – m) Write a computer program to (a) Place the exam scores 59, 60, 65, 75, 56, 90, 66, 62, 98, 72, 95, 71, 63, 77, 65, 77, 65, 50, 85, and 62 into an array. (b) Calculate the mean and standard deviation of the exam scores. (c) Assign letter grades to each exam score, ES, as follows: ES ≥ m + 1.5s A m + .5s ≤ ES < m + 1.5s B m – .5s ≤ ES < m + .5s C m – 1.5s ≤ ES < m – .5s D ES < m – 1.5s F For instance, if m were 70 and s were 12, then grades of 88 or above would receive A’s, grades between 76 and 87 would receive B’s, and so on. A process of this type is referred to as curving grades. (d) Display a list of the exam scores along with their corresponding grades as shown in Figure 6-14. 2 + (x2 – m) 2 + (x3 – m) 2 + . . . + (xn – m) 2 �� n – 1 FIGURE 6-14 Output of Project 2 x1 + x2 + x3 + . . . + xn �� n ��
3. Rudimentary Translator. Table 6.10 gives English words and their French and German equivalents. Store these words in a data file and read them into three parallel arrays, one for each language. Write a program that sorts all three arrays according to the array of English words. The program should then request an English sentence as input from the keyboard and translate it into French and German. For example, if the English sentence given is MY PENCIL IS ON THE TABLE, then the French translation will be MON CRAYON EST SUR LA TABLE, and the German translation will be MEIN BLEISTIFT IST AUF DEM TISCH. TABLE 6.10 English Words and Their French and German Equivalents YES OUI JA LARGE GROS GROSS TABLE TABLE TISCH NO NON NEIN THE LA DEM HAT CHAPEAU HUT IS EST IST PENCIL CRAYON BLEISTIFT YELLOW JAUNE GELB RED ROUGE ROT FRIEND AMI FREUND ON SUR AUF SICK MALADE KRANK AUTO AUTO AUTO MY MON MEIN OFTEN SOUVENT, OFT 4. Write a program that allows a list of no more than 50 soft drinks and their percent changes in market share for a particular year to be input and displays the information in two lists titled gainers and losers. Each list should be sorted by the amount of the percent change. Try your program on the data for the 8 soft drinks in Table 6.11. Note: You will need to store the data initially in an array to determine the number of gainers and losers. TABLE 6.11 Changes in Market Share from 1996 to 1997 of Leading Soft-Drink Brands Brand % Change Brand % Change in Market Share in Market Share Coke Classic –.2 Sprite .4 Pepsi-Cola –.4 Dr. Pepper .1 Diet Coke –.2 Diet Pepsi –.2 Mt. Dew .5 7-Up 0 Source: Beverage Digest, 1998 5. Each team in a six-team soccer league played each other team once. Table 6.12 shows the winners. Write a program to (a) Place the team names in a one-dimensional array. (b) Place the data from Table 6.12 in a two-dimensional array. (c) Place the number of games won by each team in a one-dimensional array. (d) Display a listing of the teams giving each team’s name and number of games won. The list should be in decreasing order by the number of wins. TABLE 6.12 Soccer League Winners Jazz Jets Owls Rams Cubs Zips Jazz — Jazz Jazz Rams Cubs Jazz Jets Jazz — Jets Jets Cubs Zips Owls Jazz Jets — Rams Owls Owls Rams Rams Jets Rams — Rams Rams Cubs Cubs Cubs Owls Rams — Cubs Zips Jazz Zips Owls Rams Cubs — Programming Projects 211
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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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(a) (2 < n) And (n < 6) (b) (2 < n)
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SOLUTION: In the following program,
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The Else part of an If block can be
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picTax.Cls picTax.Print “Your FIC
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Case 4, 5 picOutcome.Print “You a
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EXAMPLE 3 The following program use
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Case Else picResult.Print “The st
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4. The items in the value list must
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The hierarchy chart in Figure 4-4 s
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‘Program to compute employees’
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Private Function TaxMarried(adjPay
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and tells us whether the food meets
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S E C T I O N 5 REPETITION
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132 Computer Programming Concepts a
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Page 167: S E C T I O N 6 ARRAYS
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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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