The C++ directive ____ allows you to test whether a class has already been defined in a project; it means "if not defined."
A) #define
B) #endif
C) #ifdef
D) #ifndef

Name: The C++ directive ____ allows you to test whether a class has already been defined in a project; it means "if not defined." A) #define B) #endif C) #ifdef D) #ifndef
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The directive #ifndef means "if not defined" and is used to prevent multiple definitions of a class in a project.

The C++ Directive ____ Allows You to Test Whether a Class