We use the #ifndef, #define, and #endif
A) to prevent multiple definitions of a class
B) when we use separate files
C) whenever we use a class
D) none of the above
E) A and B

Question

Quizplus · Accepted Answer

The #ifndef, #define, and #endif preprocessor directives are used to prevent multiple definitions of a class, which is useful when we use separate files for our code. Therefore, the correct answer is E - both A and B. We do not necessarily need to use these directives whenever we use a class, so choice C is incorrect. Choice D is also incorrect because the preprocessor directives are used for a specific purpose.

We Use the #Ifndef, #Define, and #Endif