Question: Question 1 9 ( 2 points ) This directive is used to create an include guard, which allows a program to be conditionally compiled. This

Question 19(2 points)
This directive is used to create an "include guard," which allows a program to be conditionally compiled. This prevents a header file from accidentally being included more than once.
#include
#guard
#undef
#ifndef
 Question 19(2 points) This directive is used to create an "include

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