Question

When do preprocessor directives execute? A) Before the compiler compiles your program B) After the compiler compiles your program C) At the same time as the compiler compiles your program D) None of the above 

   When do preprocessor directives execute?
A) Before the compiler compiles your program
B) After the compiler compiles your program
C) At the same time as the compiler compiles your program
D) None of the above
Starting out with C++: From Control Structures through Objects
Starting out with C++: From Control Structures through Objects
Tony Gaddis 10th Edition
Chapter 2, Problem 21 ↓

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Preprocessor directives are commands in a program that are processed by the preprocessor before the actual compilation of the code begins. They typically start with a `#`, such as `#include` or `#define`.  Show more…

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When do preprocessor directives execute? A) Before the compiler compiles your program B) After the compiler compiles your program C) At the same time as the compiler compiles your program D) None of the above
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Key Concepts

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Preprocessor Directives
Preprocessor directives are special instructions in source code, typically introduced by a '#' symbol in languages like C and C++. They are handled by a tool called the preprocessor, which modifies the source code before the actual compilation process begins. These directives handle tasks such as macro substitution, file inclusion, and conditional compilation.
Compilation Process
The compilation process in programming generally comprises multiple stages, starting with preprocessing, where the preprocessor directives are executed, followed by the main compilation phase where the preprocessed code is translated into target language code. Understanding this separation highlights that the preprocessor directives are executed before the compiler conducts the compilation of the program.
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