Select all that apply. Assume you are writing a program that calculates a user's total order cost that includes sales tax of 6.5%.
Which of the following are advantages of using a named constant to represent the sales tax instead of simply entering 0.065 each time the tax is required in the code?
A) It will be easier for another programmer who may need to use this code to understand the purpose of the number wherever it is used in the code.
B) If the tax amount changes to 7.0%, the value will only have to be changed in one place.
C) It allows the end-user to always see the value of the sales tax.
D) It avoids the risk that any change to the value of sales tax will be made incorrectly or that an instance of the tax value might be missed as might occur if the number had to be changed in multiple locations.

Question

Quizplus · Accepted Answer

Using a named constant makes the code more readable and understandable, as it clearly conveys the purpose of the value. It also allows for easy modification if the tax rate changes, and it avoids errors in case the value of the tax rate needs to be changed in multiple places. However, it does not directly allow the end-user to see the value of the sales tax.

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