Computer Programming Concepts and Visual Basic David I. Schneider

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318 Computer Programming Concepts and Visual Basic two columns have been filled in, the corresponding average and grade should be recomputed. 3. Tic-Tac-Toe. Write a program that “officiates” a game of tic-tac-toe. That is, the program should allow two players to alternate entering X’s and O’s into a tictac-toe board until either someone wins or a draw is reached. If one of the players wins, the program should announce the winner immediately; in case of a draw, the program should display “Cat’s game”. The players should enter their plays by clicking on the desired cell in the tic-tac-toe grid, and the program should check that each play is valid. Optional Enhancement: Allow the players to enter a number n. The program should officiate a best-of-n tournament, keeping track of the number of games won by each player until one of them wins more than half of the games. Ignore draws. 4. Hangman. Write a program to play Hangman. (See the following Hangman form.) A list of 20 words should be placed in a sequential file and one selected at random with Rnd. The program should do the following: (a) Draw a gallows on the screen with three line controls. (b) Create a grid having 1 row and 26 columns, and fill the grid with the 26 letters of the alphabet. (c) Create a second grid of one row and the number of columns equal to the length of the word selected. (d) Each time the user clicks on one of the letters of the alphabet, that letter should be removed. If the letter is in the selected word, its location(s) should be revealed in the second grid. If the letter is not in the word, another piece of the man should be drawn with a shape control. 5. Inventory Control. Write an inventory program for a book store and save the information in a sequential file. Each record should consist of five fields—title, author, category, wholesale price, and number in stock. (The two categories are fiction and nonfiction.) At any time, the program should display the titles of the books in stock in a list box, for which the user should have the option of displaying either all titles or just those in one of the two categories. When a book is selected from the list, its title, author, category, wholesale price, and number in stock should be displayed in a picture box. The user should be able to add a new book, delete a book, or change the inventory level of a book in stock. At any time, the user should be able to calculate the total value of all books, or the total value of the books in either category.
6. Voting Machine. The members of the local Gilligan’s Island fan club bring a computer to their annual meeting to use in the election of a new president. Write a program to handle the election. The program should add each candidate to a list box as he or she is nominated. After the nomination process is complete, club members should be able to approach the computer one at a time and double-click on the candidate of their choice. When a “Tally Votes” command button is clicked, a second list box, showing the number of votes received by each candidate, should appear alongside the first list box. Also, the name(s) of the candidate(s) with the highest number of votes should be displayed in a picture box. 7. Airplane Seating Chart. An airplane has 30 rows (numbered 1 through 30), with 6 seats (labeled A, B, C, D, E, and F) in each row. Write a program to display a 7-by-31 grid with a cell for each seat. As each passenger selects a seat and a meal (regular, low-calorie, or vegetarian), the ticket agent clicks on the cell corresponding to the seat. A dialog box requests the type of meal and then one of the letters R, L, or V is placed in the cell clicked. At any time, the agent can request the number of seats filled, the number of window seats vacant, and the numbers of each type of meal ordered. Programming Projects 319
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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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S E C T I O N 6 ARRAYS
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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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Page 295 and 296: 10.1 LIST BOXES AND COMBO BOXES The
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Page 301 and 302: Private Sub cmdDisplay_Click() picF
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Page 309 and 310: THE SHAPE CONTROL The shape control
Page 311 and 312: FIGURE 10-9 A Picture Created with
Page 313 and 314: Rows 9 ScrollBars 0 - flexScrollBar
Page 315 and 316: Private Sub cmdQuit_Click() End End
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Page 333 and 334: 9. Click on the down arrow to the r
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Page 339 and 340: mary key. Databases of student enro
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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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