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Feb 8, 2018 · A Preprocessor is a system software (a computer program that is designed to run on computer’s hardware and application programs). It performs preprocessing of the High Level Language (HLL). Preprocessing is the first step of the language processing system.
- C/C++ Preprocessors
Preprocessors are programs that process the source code...
- C/C++ Preprocessors
- 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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In simple terms, a C Preprocessor is just a text substitution tool and it instructs the compiler to do the required pre-processing before the actual compilation. We'll refer to the C Preprocessor as CPP. In C programming, preprocessing is the first step in the compilation of a C code.
The C preprocessor is a macro preprocessor (allows you to define macros) that transforms your program before it is compiled. In this tutorial, you will be introduced to c preprocessors, and you will learn to use #include, #define and conditional compilation with the help of examples.
The preprocessor provides inclusion of header files, macro expansions, conditional compilation, and line control. The language of preprocessor directives is only weakly related to the grammar of C, and so is sometimes used to process other kinds of text files. [1] History.
The C preprocessor is a macro processor that is used automatically by the C compiler to transform your program before actual compilation. It is called a macro processor because it allows you to define macros , which are brief abbreviations for longer constructs.
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Aug 12, 2023 · This article will serve as your guide to understanding the preprocessor’s workings, from its role in the compilation process to its practical applications through macros and predefined macros.
