Question: please explain each step Problem 3. Create a header file which will make a decision on the size of a shape based on the user

please explain each step
Problem 3. Create a header file which will make a decision on the size of a shape based on the user input. When the user is prompted, (s)he would type in a number (Radius of a Circle or Side of a Square) then, R" for radius and "S" for square You need to use C preprocessor conditions to decide whether to perform 3.14 x R2 or SXS
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