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No semicolon (;) is expected at the end of a preprocessor directive. The only way a preprocessor directive can extend through more than one line is by preceding the newline character at the end of the line by a backslash ( \ ).
- Classes (I)
Classes (I) Classes are an expanded concept of data...
- Pointers
The values contained in each variable after the execution of...
- Data Structures
Preprocessor directives; Standard library. Input/output with...
- Compilers
Preprocessor directives; Standard library. Input/output with...
- Basic Input/Output
The << operator inserts the data that follows it into the...
- Structure of a Program
One of the most common syntax errors in C++ is forgetting to...
- Input/output With Files
Input/output with files C++ provides the following classes...
- Classes (I)
- Preprocessor Directives in C
- Types of C Preprocessors
- Macros
- File Inclusion
- Conditional Compilation
- Other Directives
- Frequently Asked Questions on C Preprocessors
Preprocessor programs provide preprocessor directives that tell the compiler to preprocess the source code before compiling. All of these preprocessor directives begin with a ‘#’ (hash) symbol. The ‘#’ symbol indicates that whatever statement starts with a ‘#’ will go to the preprocessor program to get executed. We can place these preprocessor dire...
There are 4 Main Types of Preprocessor Directives: 1. Macros 2. File Inclusion 3. Conditional Compilation 4. Other directives Let us now learn about each of these directives in detail.
In C, Macros are pieces of code in a program that is given some name. Whenever this name is encountered by the compiler, the compiler replaces the name with the actual piece of code. The ‘#define’directive is used to define a macro.
This type of preprocessor directive tells the compiler to include a file in the source code program. The #include preprocessor directiveis used to include the header files in the C program. There are two types of files that can be included by the user in the program:
Conditional Compilation in C directivesis a type of directive that helps to compile a specific portion of the program or to skip the compilation of some specific part of the program based on some conditions. There are the following preprocessor directives that are used to insert conditional code: 1. #if Directive 2. #ifdef Directive 3. #ifndef Dire...
Apart from the above directives, there are two more directives that are not commonly used. These are: 1. #undef Directive 2. #pragma Directive
Are Macros Stored in Memory like Functions?
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Jan 3, 2024 · In C++, the preprocessor directives are special commands that are used to instruct the preprocessor. It begins with a '#' symbol and tells the preprocessor to the modify source code before compilation. There are different preprocessor directives in C++ for different operations.
Aug 2, 2021 · Preprocessor directives, such as #define and #ifdef, are typically used to make source programs easy to change and easy to compile in different execution environments. Directives in the source file tell the preprocessor to take specific actions.
Nov 18, 2018 · C preprocessor is a Micro preprocessor which compiles the code before the compilation. List of all preprocessor directives: #include preprocessor directive. #define and #undef preprocessor directive. Parameterized Macros (Function like Macros) #ifdef, #ifndef and #endif preprocessor directive. #if…#elif…#else…#endif.
Sep 23, 2024 · Preprocessor directives (often just called directives) are instructions that start with a # symbol and end with a newline (NOT a semicolon). These directives tell the preprocessor to perform certain text manipulation tasks.
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Aug 1, 2023 · conditionally compile parts of source file (controlled by directive #if, #ifdef, #ifndef, #else, #elif, #elifdef, #elifndef (since C++23), and #endif). replace text macros while possibly concatenating or quoting identifiers (controlled by directives #define and #undef , and operators # and ## ).
