For a Program That Reads Three Letter Grades and Calculates

question 72

Multiple Choice

For a program that reads three letter grades and calculates an average of those grades, which of the following would be a good design based on stepwise refinement?

• A) Write one method that reads three letter grades, converts each letter grade to a number, and calculates the average of the three numbers.
• B) Write one method that reads three letter grades, and a second method to convert each letter to a number and calculate the average of the three numbers.
• C) Write one method that reads a letter grade and returns the number equivalent, and one method that computes the average of three numbers.
• D) Stepwise refinement cannot be applied to this problem.

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