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1. By selecting a single red or black square, at 35-to-1 odds. (Thus, if a player were to bet $1.00 and win, he or she would receive a total of $36.00 the original $1.00 plus an additional $35.00.) 2. By selecting a color (either red or black) at 1-to-1 odds. (Thus, if a player chose red on a $1.00 bet, he or she would receive $2.00 if the marble came to rest beneath any red square.) 3. By selecting either the odd or the even numbers (excluding 0 and 00) at 1-to-1 odds. 4. By selecting either the low 18 or the high 18 numbers at 1-to-1 odds (again, 0 and 00 are excluded). The player will automatically lose if the marble comes to rest beneath one of the green squares (0 or 00). Write a Visual Basic program that will simulate a roulette game. Allow the players to bet any way they wish. Then display the outcome of each game, followed by a message indicating whether each player has won or lost. Include arrays and procedures, as appropriate. 8.60 Write a Visual Basic program that will simulate a game of BINGO. Display each letter-number combination as it is drawn. Be sure that no combination is drawn more than once. Remember that each of the letters B-I-N-G-O corresponds to a certain range of numbers, as indicated below.
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B: I: N: G: O: 1 16 31 46 61 15 30 45 60 75
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Include arrays and procedures within the program, as appropriate.
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A file is an orderly, self-contained collection of information. Any type of information can be stored within a file. Thus, a file may contain the instructions that comprise a Visual Basic program, it may be a graphical bitmap, it may contain information used to create music, or it may consist of data values (typically, numerical values and strings). This last type of file is commonly known as a data file. Data files offer a convenient means of storing large quantities of information, since the files can be stored on auxiliary storage devices (e.g., a hard drive) and read into the computer as needed. Moreover, individual data items within a data file can easily be read into the computer, updated and written back out to the data file, all under the control of a single program. This chapter is concerned with Visual Basic programs that create and process data files.
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9.1 DATA FILE CHARACTERISTICS Visual Basic recognizes three different types of data files: sequential files (also called text files), random access files, and binary files (also called unformatted files). Sequential files are the easiest to work with, since they can be created by a text editor or word processor, or by a Visual Basic program. Such files consist of variable-length strings, organized into individual lines of text. Sequential files can be displayed or printed at the operating system level (outside of Visual Basic), and they are easily imported into an application program, such as a word processor or spreadsheet program. In order to access a particular line of text, however, you must start at the beginning of the file and progress through the file sequentially, until the desired line has been located. This process can be very time-consuming when searching through a large file. Random access files are organized into fixed-length records. (A record is a set of related data items, such as a name, an address and a telephone number. Each data item within a record fills a field). Any record can be accessed directly by specifying the corresponding record number or record location. Thus, it is not necessary to read through the entire file in order to access a particular record. Applications that require direct access to individual records without regard to their order (as, for example, the daily updating of customer accounts as they are received) will therefore execute much faster with direct rather than sequential data files. Finally, binary files store information as a continuous sequences of bytes. Such files appear unintelligible when printed or displayed on a computer screen, but their contents can be read into or written out of a computer faster than other file types, particularly sequential files.
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9.2 ACCESSING AND SAVING A FILE IN VISUAL BASIC: THE COMMON DIALOG CONTROL Visual Basic includes special tools for opening an existing file, and for saving either a new file or an existing file that has been modified. These tools are included in a group of common dialog objects that must be added to the Toolbox before any of these tools can be accessed. To do so, select Components from the Project menu. Then click on the Controls tab and check the box labeled Microsoft Common Dialog Control, as shown in Fig. 9.1. Once the common dialog control has been activated, the common dialog control icon will appear in the lower right portion of the Toolbox, as shown in Fig. 9.2.
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