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Preprocessor Directives in C
Preprocessor directives are commands that tell the preprocessor, a program that processes the source code before it passes through the compiler, to perform some specific tasks2. Preprocessor directives begin with a hash (#) symbol and do not require a semicolon at the end1.
There are three main categories of preprocessor directives in C1:
Macro substitution directives: These are used to define or undefine macros, which are symbolic constants or expressions that can be replaced by the preprocessor with their corresponding values or expressions. For example:
// Define a macro named PI with the value 3.14#define PI 3.14// Undefine the macro named PI#undef PI// Define a macro named SQUARE with an argument x#define SQUARE(x) (x) * (x)// Use the macroint y = SQUARE(5); // y is assigned 25File inclusion directives: These are used to include the contents of another file in the source code program. There are two types of file inclusion directives: #include and #include "filename". The former is used to include header files from the standard library, while the latter is used to include user-defined header files or other source files. For example:
// Include the standard input/output header file#include <stdio.h>// Include a user-defined header file named "myheader.h"#include "myheader.h"Compiler control directives: These are used to control the compiler actions, such as conditional compilation, error generation, or line control. Conditional compilation allows the programmer to include or exclude a section of code based on some conditions. For example:
// Define a macro named DEBUG#define DEBUG// If DEBUG is defined, include this section of code#ifdef DEBUGprintf("Debug mode is on.\n");#endif// If DEBUG is not defined, include this section of code#ifndef DEBUGprintf("Debug mode is off.\n");#endifLearn more✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Learn about preprocessors, programs that process the source code before compilation. Find out the types, syntax, and examples of preprocessor directives in C, such as #define, #include, #ifdef, etc. See more
Preprocessor programs provide preprocessor directives that tell the compiler to preprocess the source code before compiling. All … See more
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. See more
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: See more
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WebLearn how to use the C/C++ preprocessor to conditionally compile code, insert files, specify error messages, and apply machine-specific rules. The article covers preprocessor directives, operators, macros, and pragmas with examples and links to related sections.
C preprocessor directives – #include, #define, #undef
WebNov 18, 2018 · Learn how to use C preprocessor directives to include files, define macros, check conditions and more. See syntax, examples and output of #include, #define, #undef, #ifdef, #ifndef and other directives.
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Preprocessor - cppreference.com
WebJun 22, 2023 · Directives. The preprocessing directives control the behavior of the preprocessor. Each directive occupies one line and has the following format: # character. preprocessing instruction (one of define, undef, include, if, ifdef, ifndef, else, elif, elifdef, elifndef(since C23), endif, line, embed(since C23), error, warning(since C23), pragma) [1]
C Preprocessor Directives - C and C++ Syntax Reference
WebLearn how to use the C preprocessor to modify a source file before compiling it. Find out the syntax and examples of #include, #define, #if, #error, and other preprocessor commands.
Web4 days ago · Preprocessors are a way of making text processing with your C program before they are actually compiled. Before the actual compilation of every C program it is passed through a Preprocessor. The Preprocessor looks through the program trying to find out specific instructions called Preprocessor directives that it can understand.
Web31 rows · Obsolete Features. #undef. Undefining and Redefining Macros. #warning. Diagnostics. Index of Directives (The C Preprocessor)
WebTable of Contents. The C preprocessor implements the macro language used to transform C, C++, and Objective-C programs before they are compiled. It can also be useful on its own. Copyright © 1987-2024 Free Software Foundation, Inc.
WebThe 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. The C preprocessor provides four separate facilities that you can use as you see fit:
WebFeb 26, 2023 · Learn how to use preprocessor directives in C to modify, include, define, and conditionally compile your code. See examples of macro expansion, conditional compilation, and error handling with #define, #include, #ifdef, #if, #error, and #pragma.
C Preprocessor and Macros - Programiz
WebLearn how to use C preprocessor directives to include header files, define macros, and perform conditional compilation. See examples of #include, #define, #if, #elif, #else, #endif, and predefined macros.
C Language: Preprocessor Directives - TechOnTheNet
WebDirectives. C Language: Preprocessor Directives. This C tutorial explains how to use preprocessor directives in the C language. Description. The preprocessor will process directives that are inserted into the C source code. These directives allow additional actions to be taken on the C source code before it is compiled into object code.
C preprocessor - Wikipedia
WebContents. hide. (Top) History. Phases. Including files. Conditional compilation. Macro definition and expansion. Order of expansion. Special macros and directives. Token stringification. Token concatenation. User-defined compilation errors. Binary resource inclusion. Implementations. Compiler-specific preprocessor features.
Tutorials - C Preprocessor Tricks - Cprogramming.com
WebDirectives are commands that tell the preprocessor to skip part of a file, include another file, or define a constant or macro. Directives always begin with a sharp sign (#) and for readability should be placed flush to the left of the page. All other uses of the preprocessor involve processing #define'd constants or macros.
Preprocessor directives - C++ Users
WebLearn how to use preprocessor directives to define macros, include headers, specify compiler options and access predefined macro names in C++. See examples, syntax and explanations of #define, #include, #pragma and other directives.
Web3.9 Directives Within Macro Arguments ::::: 36 3.10 Macro Pitfalls::::: 36 ... The C preprocessor is intended to be used only with C, C++, and Objective-C source code. In the past, it has been abused as a general text processor. It will choke on input which does not obey C’s lexical rules. For example, apostrophes will be interpreted as the
Preprocessor - cppreference.com
WebAug 1, 2023 · Directives. The preprocessing directives control the behavior of the preprocessor. Each directive occupies one line and has the following format: the # character. a sequence of: a standard-defined directive name (listed below) followed by the corresponding arguments, or
Preprocessor directives | Microsoft Learn
WebAug 2, 2021 · Preprocessor directives. Article. 08/02/2021. 6 contributors. Feedback. 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.
Conditional inclusion - cppreference.com
WebJun 29, 2023 · Syntax. Explanation. The conditional preprocessing block starts with #if, #ifdef or #ifndef directive, then optionally includes any number of #elif, #elifdef, or #elifndef(since C23) directives, then optionally includes at most one #else directive and is terminated with #endif directive.
C Preprocessor Directives - GeeksforGeeks
WebJan 30, 2024 · In C, preprocessor directives are categorized based on their functionalities following are the types of preprocessor directives: Macro Definition. File Inclusion directive. Conditional Compilation. Line control. Error directive. Pragma direcive. Let us now have a look at each one of these directives in detail: 1. #define – Macro Directive.
#if, #elif, #else, and #endif directives (C/C++) | Microsoft Learn
WebPreprocessor operators. See also. The #if directive, with the #elif, #else, and #endif directives, controls compilation of portions of a source file. If the expression you write (after the #if) has a nonzero value, the line group immediately following the #if directive is kept in the translation unit. Grammar. conditional :
Pragmas (The C Preprocessor) - GCC, the GNU Compiler …
WebThe ‘ #pragma ’ directive is the method specified by the C standard for providing additional information to the compiler, beyond what is conveyed in the language itself. The forms of this directive (commonly known as pragmas) specified by C standard are prefixed with STDC. A C compiler is free to attach any meaning it likes to other pragmas.
PostgreSQL: Documentation: 17: 34.9. Preprocessor Directives
WebMay 23, 2024 · The embedded SQL preprocessor will look for a file named filename.h, preprocess it, and include it in the resulting C output. Thus, embedded SQL statements in the included file are handled correctly. The ecpg preprocessor will search a file at several directories in following order ...
Preprocessor directives - C# reference | Microsoft Learn
WebFeb 1, 2023 · You use four preprocessor directives to control conditional compilation: #if: Opens a conditional compilation, where code is compiled only if the specified symbol is defined. #elif: Closes the preceding conditional compilation and opens a new conditional compilation based on if the specified symbol is defined.
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