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Questions and Answers
What is the purpose of the #include directive in C/C++?
What is the purpose of the #include directive in C/C++?
- To specify conditional compilation blocks based on defined macros
- To generate an error message during compilation
- To define macro substitutions for use in the source code
- To include header files in the source code before compilation (correct)
How are macros different from functions in C/C++?
How are macros different from functions in C/C++?
- Macros are preprocessed before compilation, whereas functions are compiled and executed at runtime (correct)
- Macros are defined using the #define directive, while functions are defined using the function keyword
- Macros can accept a variable number of arguments, while functions have a fixed number of parameters
- Macros can be called recursively, while functions cannot
What is the purpose of the #error directive in C/C++?
What is the purpose of the #error directive in C/C++?
- To specify conditional compilation blocks based on defined macros
- To define macro substitutions for use in the source code
- To include header files in the source code before compilation
- To halt compilation and generate an error message with a specified text (correct)
Which directive is used to include the contents of a file in a C/C++ program?
Which directive is used to include the contents of a file in a C/C++ program?
What is the purpose of the #define directive in C/C++?
What is the purpose of the #define directive in C/C++?
In conditional compilation, which directive is used to check if a macro is defined or not?
In conditional compilation, which directive is used to check if a macro is defined or not?
What is the purpose of the #pragma directive in C/C++?
What is the purpose of the #pragma directive in C/C++?
What is the difference between parameterized macros and nested macros in C/C++?
What is the difference between parameterized macros and nested macros in C/C++?
Which predefined macro in C/C++ can be used to obtain the current source file name?
Which predefined macro in C/C++ can be used to obtain the current source file name?
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Study Notes
Preprocessor Directives in C/C++
- The
#includedirective is used to include the contents of a file in a C/C++ program, allowing for modularity and reuse of code. - Macros are different from functions in C/C++ in that macros are expanded at compile-time, whereas functions are executed at runtime, and macros do not have type checking or parameter validation.
Error Handling
- The
#errordirective is used to issue an error message when the compiler encounters it, allowing for custom error handling and debugging.
Macro Definition
- The
#definedirective is used to define a macro, which is a sequence of tokens that can be replaced with a defined value or expression at compile-time.
Conditional Compilation
- The
#ifdefdirective is used to check if a macro is defined or not, allowing for conditional compilation and customization of code based on macro definitions.
Compiler Directives
- The
#pragmadirective is used to provide additional information to the compiler, allowing for customization of compiler behavior and optimization of code.
Macros
- Parameterized macros and nested macros are two types of macros in C/C++, with parameterized macros allowing for macro arguments and nested macros allowing for macros within macros.
Predefined Macros
- The
__FILE__predefined macro can be used to obtain the current source file name in C/C++.
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