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Create a VB calculator application that appears as in the screen shots below.
The user enters numbers in the textboxes labelled Number 1 and Number 2. When a calculation button (Add, minus etc.) is pressed, the result for the appropriate calculation appears in the textbox labelled Answer and the appropriate operation symbol (+, - etc.) appears between the number textboxes. Whenever the user starts to enter a new number (Number 1 or 2), the operation symbol +, -, etc. is to disappear and the Answer and operation symbol are to be blanked out to prevent the display of incorrect results, as shown below:
Whenever the user clicks or tabs to the textboxes labelled Number 1 and Number 2, the field is to be blocked so that a completely new number can be entered. The Answer textbox is to be locked to prevent manual editing of any displayed results. Also code is required to provide appropriate error checks for the entry of non-numeric (including blank) Number 1 and Number 2 fields, and to prevent a divide by zero error (for both Divide and Modulo). Any detected errors should be accompanied by an appropriate error message with focus being given to the textbox containing the erroneous value to facilitate correction. Meaningful variable/control names and appropriate comments should be provided.
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#12 derived preferredCustomer class
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