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Restrict the project to the following countries and their corresponding capitals, as in Prob. 4.51. Canada England France Germany India Italy Japan Mexico People s Republic of China Russia Spain United States Ottawa London Paris Berlin New Delhi Rome Tokyo Mexico City Beijing Moscow Madrid
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5.42 Create a Visual Basic project that will either convert U.S. dollars into a foreign currency or convert a foreign currency into U.S. dollars, as in Prob. 4.52. Use a menu to determine which type of conversion will be carried out (i.e., U.S. to foreign, or foreign to U.S.). Attach an appropriate dialog box to each of the menu selections. The foreign currencies and their U.S. dollar equivalents are: 1.4 2.3 6.8 2.0 100 9.5 1.6 1 U.S. dollar = 0.6 British pounds
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2000 Italian lira Japanese yen Mexican pesos Swiss francs
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Your project should include two option buttons within a frame, to select either U.S. to foreign conversion or foreign to U.S. conversion. Nine additional option buttons should be placed within another frame to select the particular foreign currency. Use a text box to specify a given amount of money in the source currency, and another text box to display the equivalent amount of money in the target currency. Include an appropriate set of labels for each conversion type. 5.43 In Prob. 4.55 we considered the following problem: Deposit P dollars in a savings account for n years. If the money earns interest at the rate of i percent per year, compounded annually, then after n years, the original sum of money will have increased to F, where F = P (1 + 0.01i ) n F = P (1 + 0.01i / 4 )
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4n 12n 365n
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F = P (1 + 0.01i / 12)
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F = P (1 + 0.01i / 365)
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(Note: In all of these expressions, i is the annual interest rate, expressed as a percentage, and n is the number of years.)
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Dutch guilders German marks French francs
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Canadian dollars
AM FL Y
Washington, D.C. for annual compounding for quarterly compounding for monthly compounding for daily compounding
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[CHAP. 5
Recall that these results can be generalized into the following single equation: F = P (1 + 0.01i / c ) cn where c takes on the following values: Annual compounding: Quarterly compounding: Monthly compounding: Daily compounding: c=1 c=4 c = 12 c = 365
Create a Visual Basic project to determine the future value of a deposit (F), given P, r and n as input values, using a menu to select the frequency of compounding. Enter each of the input values into an appropriate dialog box. Display the final result in a separate message box. Test the program using input values of your own choosing.
6
Debugging and Executing a New Project
____________________________
By now we have learned enough about Visual Basic to create complete Visual Basic projects. We therefore pause briefly from our coverage of new features and devote some attention to the methods used to detect and correct the different types of errors that can occur in improperly written programs. We will also show how a project can be compiled into an executable package that can be executed independently of the Visual Basic development system.
6.1 SYNTACTIC ERRORS Many different kinds of errors can arise when creating and executing a new Visual Basic project. For example, syntactic errors (also called compilation errors) occur when Visual Basic commands are written improperly. Syntactic errors are relatively easy to fix, since the Visual Basic development system does a good job of flagging these errors. When a syntactic error is detected, the offending statement is highlighted within the Code Editor Window, and the nature of the error is explained (often in cryptic terms) within a message box.
EXAMPLE 6.1 SYNTACTIC ERRORS
Let s once again consider the piggy bank problem originally presented in Example 4.5. Recall the single Visual Basic command associated with the Go command button:
Text6.Text = 0.01 * Val(Text1.Text) + 0.05 * Val(Text2.Text) + 0.1 * Val(Text3.Text) + 0.25 * Val(Text4.Text) + 0.5 * Val(Text5.Text)
Now suppose that the right parenthesis at the end of the command had inadvertently been omitted; i.e.,
Text6.Text = 0.01 * Val(Text1.Text) + 0.05 * Val(Text2.Text) + 0.1 * Val(Text3.Text) + 0.25 * Val(Text4.Text) + 0.5 * Val(Text5.Text
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