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.

Question

Quizplus · Accepted Answer

Stepwise refinement involves breaking down a problem into smaller sub-problems, with each sub-problem representing a single task or function. In this case, breaking down the problem into two separate functions - one to convert letter grades to numbers and another to calculate the average - is a good design choice. This makes the code more modular and easier to understand, as each function has a clear and specific task. Therefore, option C is the best choice.

For a Program That Reads Three Letter Grades and Calculates