Which of the following is a directive used to create an "include guard" that allows a program to be conditionally compiled to prevent a header file from accidentally being included more than once?
A) #include
B) #guard
C) #ifndef
D) #endif
E) None of these

Question

Quizplus · Accepted Answer

The "#ifndef" directive, also known as "if not defined," is commonly used to create an include guard in C and C++ programs. This allows the header file to be included only once during the compilation process, preventing duplicate definitions and potential issues with the code. The other directives listed, "#include," "#guard," and "#endif," are not used for creating an include guard.

Which of the Following Is a Directive Used to Create