Conditional value for #define

Question

I want to define the kDependentMacro macro as 38 if the kIndependentMacro macro is defined and 40 otherwise. What is the easiest way to do this?

Answer 1

#ifdef kIndependentMacro
#  define kDependentMacro 38
#else
#  define kDependentMacro 40
#endif