Credit card companies typically assign a special digit, called a check digit, to the end of each customer’s credit card number. One simple method to create the check digit is to multiply every other digit in the credit card number by two, add the products to the remaining digits to get the total, and then take the last digit in the total and append it to the end of the credit card number. Create a Visual Basic Windows application. Use the following names for the solution, project, and form file, respectively: Georgetown Solution, Georgetown Project, and Main Form.vb. The interface allow the user to enter a five-digit credit card number, with the fifth digit being the check digit. There is a Verify button and an Exit button. The Verify button’s Click event procedure should use the method listed below to verify that the credit card number is ***** The procedure should display appropriate messages indicating whether the credit card number is ***** or invalid. Check Digit Algorithm First four digits

The check digit algorithm used by credit card companies is a method to validate the integrity of a credit card number. It involves multiplying every other digit in the credit card number by two, adding the products to the remaining digits, and then taking the last digit of the total and appending it to the end of the credit card number. This check digit serves as a checksum, allowing for easy detection of data entry errors or potential fraudulent activity.

To create a Visual Basic Windows application to implement this algorithm, we can follow the specified names for the solution, project, and form file. The solution will be named Georgetown Solution, the project will be named Georgetown Project, and the form file will be named Main Form.vb. The user interface of the application will include a text box for the user to enter the five-digit credit card number, with the fifth digit being the check digit. There will also be two buttons, one for verification and one for exiting the application.

The verification process will be triggered when the user clicks the Verify button. In the Click event procedure of the Verify button, we will implement the check digit algorithm to verify the credit card number. The algorithm involves the following steps:

1. Take the first four digits of the credit card number.
2. Multiply each digit in the first four digits by two.
3. Add the products of step 2 to the remaining digit in the credit card number.
4. Take the last digit of the total from step 3.
5. Append the check digit obtained in step 4 to the end of the credit card number.

After performing these steps, we can compare the check digit obtained with the fifth digit entered by the user. If they match, it indicates that the credit card number is valid. Otherwise, it is considered invalid. We can display appropriate messages indicating the validity of the credit card number based on the comparison result.

In summary, the Visual Basic Windows application named Georgetown Solution, with the project named Georgetown Project and the form file named Main Form.vb, will implement the check digit algorithm to verify the validity of a five-digit credit card number. The verification process involves multiplying every other digit by two, adding the products to the remaining digits, and comparing the check digit obtained with the fifth digit entered by the user. Appropriate messages will be displayed to indicate whether the credit card number is valid or invalid.