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Extra info for Advanced Visual Basic 2010 (5th Edition)
12. What are the three components of the three-tier application model? 3 Enumerated Types An enumerated type is a list of symbolic names associated with integer constants. Its greatest value is in making a program more readable by giving names to what would otherwise be integers. Suppose, for example, that an application worked with four different account 23 24 Chapter 1 Classes types, numbered 0, 1, 2, and 3. It might be difficult, when looking at program code, to recall which integer corresponded to each type of account.
Text = ''Test average is not a valid number'' 9: End If 10: End Sub Line 4 calls the Student constructor, assigning values to the three class variables. TryParse fails to convert the test average, line 8 displays an error message in the lblStudent label. 3 in the three text boxes and click the Save button. The output should appear as in Figure 1-10. Enter 100011, Adams, XX in the three text boxes and click the Save button. The output should appear as in Figure 1-11. Figure 1-10 Sample output from Test 1 21 22 Chapter 1 Classes Figure 1-11 Sample output from Test 2 ReadOnly Properties A ReadOnly property allows methods outside the class to get the current property value but not to change it.
5. Why is it inconvenient for constructor parameters to have the same names as class-level properties or variables? 6. Why is a default constructor sometimes omitted in classes? 7. Withdraw method let the caller know that the amount being withdrawn is larger than the balance? Can you think of a better way to signal this type of error? Algorithm Workbench 1. Create a property that gets and sets a person’s date of birth. Include appropriate error checking. 2. Create a constructor for a class named Investment that contains one required parameter and two optional parameters.