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Abigayle is running is her first marathon, and wants to make sure she has proper shoes to train in. She has created a list of running shoe brands that she will evaluate before making her purchase. This list makes up Abigayle's
#ifndef Directive
A preprocessor directive in C/C++ used to check if a symbol has not been defined before including a section of code.
#ifdef Directive
In C/C++ programming, it is used to make compilation decisions based on whether a particular identifier has been defined earlier in the code or through command-line flags.
Conditional Compilation
A feature in some programming languages that allows the compiler to include or exclude portions of code based on certain conditions.
#ifndef Condition
A preprocessor directive in C/C++ used to check if a specific identifier is not defined before including or skipping part of the code.
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