Instructor solution manual to visual basic 2015 unleashed

Debug Procedure: Modify the commission calculator application given in Appendix A to remove syntactical, and logical errors. In visual studio, open the commission calculator solution.sln file.

Open the code editor window. In the code window jagged blue lines tell the location of syntax errors in the code. There are two syntactical errors in btnCalculateClick method:-. One jagged line indicating a syntactical error is during declaration of named constant.

The syntax requires a D (for Decimal) to be appended to the constant value. Rectify the error to get the correct statement as Const decRATE As Decimal = 0.1D.

The second jagged line indicating a syntactical error occurs when the inputs are assigned to the variables. The syntax requires that the first argument to Decimal.TryParse method be a string. In this case, it is the value in the textboxes. Rectify the error by adding.Text to the textboxes as the argument. Decimal.TryParse(txtSales1.Text, decSales1). Repeat the same for rest of assignment statements. After rectification of the syntactical errors, start the application.

Once the application is run with values say 10, 20 and 30 in textboxes, the calculated commission is $33.00. Actually, it should be $6.00.

To find out the error, place a breakpoint at the line where commission is calculated i.e at decCommission = decSales1 + decSales2 + decSales3. decRATE Now debug the application. Specify values say 10, 20 and 30 in textboxes, then press calculate button. While execution is paused at breakpoint, place the mouse pointer on the variables in code window to check their values. The variables hold correct value but the calculation formula is incorrect.

This is because, in mathematics, multiplication are performed before addition. As a result, the value of decRATE is multiplied only with value of decSales3 variable and then added to other two variable values.

Now, ‘continue’ execution of application and close it. To correct the error, place all the additions in a bracket and then multiply the total with the commission rate. The correct statement now becomes decCommission = ( decSales1 + decSales2 + decSales3 ).

decRATE. Program:. Name:Corrected Commission Calculator Project.Purpose: Display the quarterly commission.

Option Explicit On Option Strict On Option Infer Off Public Class frmMain In the event of click of ‘Exit’ Button, close the application. What are Chegg Study step-by-step Programming With Microsoft Visual Basic 2015 7th Edition Solutions Manuals?

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Instructor Solution Manual To Visual Basic 2015 7th Edition

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