Preprocessor - Wikipedia
网页In computer science, a preprocessor (or precompiler) [1] is a program that processes its input data to produce output that is used as input in another program. The output is said to be a preprocessed form of the input data, which is often used by some subsequent programs like compilers.
C Preprocessors - GeeksforGeeks
网页2024年8月28日 · Preprocessors are programs that process the source code before compilation. Several steps are involved between writing a program and executing a program in C. Let us have a look at these steps before we actually start learning about Preprocessors. You can see the intermediate steps in the above diagram.
C preprocessor - Wikipedia
网页The C preprocessor is the macro preprocessor for several computer programming languages, such as C, Objective-C, C++, and a variety of Fortran languages. The preprocessor provides inclusion of header files, macro expansions, conditional compilation, and line control.
Preprocessor - cppreference.com
网页2023年8月1日 · The preprocessor has the source file translation capabilities: conditionally compile parts of source file (controlled by directive #if, #ifdef, #ifndef, #else, #elif, #elifdef, #elifndef(since C++23), and #endif).
2.10 — Introduction to the preprocessor – Learn C
网页2024年9月12日 · In this phase, a program called the preprocessor makes various changes to the text of the code file. The preprocessor does not actually modify the original code files in any way -- rather, all changes made by the preprocessor happen either temporarily in-memory or using temporary files.
C/C++ preprocessor reference | Microsoft Learn
网页2021年8月2日 · The preprocessor performs preliminary operations on C and C++ files before they are passed to the compiler. You can use the preprocessor to conditionally compile code, insert files, specify compile-time error messages, and apply machine-specific rules to sections of code.
Preprocessor directives - C++ Users
网页The preprocessor examines the code before actual compilation of code begins and resolves all these directives before any code is actually generated by regular statements. These preprocessor directives extend only across a single line of code.
Preprocessor | Microsoft Learn
网页2021年8月2日 · The preprocessor is a text processor that manipulates the text of a source file as part of the first phase of translation. The preprocessor doesn't parse the source text, but it does break it up into tokens to locate macro calls.
C++ Preprocessor And Preprocessor Directives - GeeksforGeeks
网页2024年1月3日 · The preprocessor in C++ is used for processing the code before it is compiled by the compiler. It does many tasks such as including files, conditional compilation, using macros, etc. The preprocessor also allows the developers to select which portions of code should be included or excluded.
Top (The C Preprocessor) - GCC, the GNU Compiler Collection
网页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.