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How do you design a function named feetToinches that accepts a number of feet as an argument and returns the number of inches in that many feet?
Wiki User
∙ 11y ago
You design it as an inline function with a constant unsigned reference parameter. Since there are 12 inches to the foot, the return value is the product of the parameter and 12. However, you must also ensure the return type has enough bits to store the result.
C++ example:
inline unsigned int feetToinches( const unsigned int & feet ){
return( feet < 357913941 ? feet * 12 : 0 ); }
The above example assumes an int is 32-bits wide. If the input is larger than 357913941 (feet) then there won't be enough bits to store the result, so zero is returned instead. If the input is non-zero and the return is zero, you know the conversion failed.
We use unsigned data types because you cannot have a negative unit of distance. We use a reference parameter to prevent the parameter from being copied (not strictly necessary if the type will fit within a pointer variable, but good practice nonetheless). The parameter is constant because the function does not need to modify the parameter. It is inline because the code is not complicated and is a prime candidate for inline expansion, thus eliminating the need for a function call altogether.
Wiki User
∙ 11y ago
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