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Expand the program described in Problem 9.48 so that new records (new baseball teams) can be added, old records can be deleted and existing records can be modified. Be sure to maintain the records in alphabetical order. Write a program that will create a sequential data file containing baseball team records. Include the information described in Example 9.11 for each team. Write a program that will read the sequential data file containing baseball team records created in Prob. 9.50 and do any one of the following. (a) Update the team standings, as described in Example 9.11. (b) Sort the teams with respect to the percentage of games won (highest to lowest) and display the sorted list. Include complete information (i.e., name, games won, games lost and percentage of games won) for each team. Use a two-file update procedure, as described in Example 9.7. Also, use a sort strategy similar to that described in Example 8.10. Test the program with the sequential data file created in Problem 9.50.
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Modify the multilingual hello program shown in Example 4.9 so that it utilizes a sequential data file. The program should be able to read the data file and display the appropriate greeting for a selected language, as in the earlier example. (See also Example 8.6.) Create the data file with a text editor or a word processor. Place each language and its accompanying greeting on a separate line. A group of students earned the following scores for the six examinations taken in a Visual Basic programming course. Name Adams Brown Davis Fisher Hamilton Jones Ludwig Osborne Prince Richards Smith Thomas Wolfe Zorba 45 60 40 0 90 95 35 75 85 50 70 10 25 65 80 50 30 5 85 90 50 60 75 60 60 25 40 80 Exam Scores (percent) 80 70 10 5 100 80 55 75 60 50 75 35 65 70 95 75 45 0 95 95 65 60 85 35 70 20 75 100 55 55 60 10 90 85 45 70 90 65 55 30 85 60 _ 75 80 55 5 90 80 70 80 100 70 75 10 95 95
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Write a Visual Basic program that will accept each student s name and exam scores as input and then determine an average score for each student. Place the names and exam scores, including the student average, in an appropriate data file. Use a separate dialog box for entering and displaying information for each student. (See Problem 8.50, which emphasizes the use of arrays rather than data files for this application.)
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Create a Visual Basic program that will read the data file created in Problem 9.53 and calculate an overall class average (i.e., the average of the individual student averages) and the deviation of each student s average about the overall class average. Display the class average, followed by the following information for each student: Student name. Individual exam scores. Student average. Deviation of the student average about the class average.
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Extend the Visual Basic program written for Problem 9.54 so that the student exam records can be modified after they have been created. Include a provision for each of the following features. (a) Change an existing exam score. (b) Add a new exam score. Write the modified information to a new data file before ending the program execution.
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Modify the craps game simulator given in Example 7.10 so that it simulates a specified number of games and saves the outcome of each game in a data file. At the end of the simulation, read the data file to determine the percentage of wins and losses that the player has experienced. Test the program by simulating 1000 consecutive games. Based upon these results, estimate the odds of winning when playing craps. Extend the Visual Basic program written for Problem 8.39 (reordering a list of numbers four different ways) so that the original set of numbers is written to a random access data file, which is later updated by replacing the original set of numbers with the sorted numbers. Include all of the following features. (a) Enter a set of numbers from the keyboard and write it out to the data file. (b) Read the numbers from the data file, sort the numbers in one of the four ways indicated in Problem 8.39 and write the sorted numbers out to the data file. (c) Read the numbers (either sorted or unsorted) from the data file and display them on the screen. 85 10 51 49 34 4 71 45 19 50
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Test the program using the following values, originally presented in Prob. 8.39. 43 83 61 14 94 9.58 65 59 32 23 86
Extend the Visual Basic program written for Problem 4.52 (U.S./foreign currency equivalents) so that the list of currency equivalents is stored alphabetically in a random access data file. Place the name of each country and its currency equivalent in a separate record. Include a provision for each of the following features. (a) Enter the list of countries and currency equivalents from the keyboard, with the countries in alphabetical order. Write each record to the data file as it is entered. (b) Convert a specified amount of money from one currency to another. Use a binary search routine to locate each record, as required. (c) Read the entire data file and display its contents on the screen.
For your convenience, the list of U.S./foreign currency equivalents originally presented in Problem 4.52 is presented below.
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