What role do preprocessor directives play in the structure of a C++ program?
- They define macros for code substitution
- They instruct the compiler to include external header files
- They manage memory allocation
- They specify the program's entry point
Preprocessor directives play a crucial role in C++ program structure. They are used to define macros for code substitution, conditionally include or exclude parts of the code, and instruct the compiler on various aspects of compilation. While they can include external header files, their primary role is code preprocessing before compilation, not memory allocation or specifying entry points.
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