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The successive watch values leads us to conclude that the assignment statement for A should be written
A = P * r * f / (f 1)
rather than
A = P * r * f / f 1
as it is currently written. After making this correction and rerunning this problem, we obtain a correct value of A = 251.23 as a final result. In other words, a loan of $10,000 at 9.5 percent annual interest requires a repayment schedule of $251.23 per month for 48 months. Note that we were able to identify the location and then the source of this error through the use of stepping and watch values within the Visual Basic debugger.
6.6 USER-INDUCED ERRORS User-induced errors are the result of mistakes made by the user when the program is executing (e.g., entering numbers that are out of range, or entering nonnumerical characters when a numerical value is expected). Errors of this type can usually be anticipated and trapped by one or more If-Then-Else blocks. However, it may be more convenient to use an error handler routine to trap the error and then take appropriate remedial action. The use of error handlers is described in the next section.
6.7 ERROR HANDLERS An error handler is a series of Visual Basic statements that is intended to recognize an error when it occurs (i.e., to trap an error) and then provide appropriate corrective action. The nature of the corrective action
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depends on the type of error encountered. In some situations, the user can re-enter input data that will prevent the error from occurring. In other situations, the error can simply be bypassed, or the source of the error can be corrected automatically. When writing an error handler, we must be able to recognize an error when it occurs and then redirect the program logic to a special part of the program that is written specifically to deal with the error. This is accomplished with the On Error-GoTo statement, which redirects the program logic to to a remote statement when an error occurs. The remote statement includes a label that is specified within the On Error-GoTo statement, thus providing a target for the continuing flow of program logic. The following skeletal outline illustrates a typical error trap within an event procedure.
Private Sub procedure name On Error GoTo label . . . . . Exit Sub
label: remote statement
. . . . . Resume End Sub
'Begin error trap
The On Error-GoTo statement directs the program logic to the remote statement with the specified label (the first statement in the error trap routine) in the event that an error is detected during the program execution. This statement and the succeeding statements, through and including Resume, are then executed. (Presumably, these statements will provide whatever actions are required to correct the error.) The Resume statement can be written in several different ways. If it is written simply as Resume, as in the above skeletal outline, it returns the program logic to the statement that originally caused the error. This works well if the source of the error has been corrected within the error trap. You can also write the Resume statement as Resume Next or Resume return label. Resume Next causes the program logic to be returned to the statement immediately following the one that caused the error. Resume return label causes the program logic to be returned to the remote statement with the specified return label. (Note that this labeled statement is not the beginning of the error trap. Thus, there are two different labeled statements one to initiate the error trap, and the other to serve as a return point once the error-trap routine has been completed.) Error trapping within a program can be disabled by a special form of the On Error-GoTo statement; namely,
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