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21 Δεκ 2021 · According to C89 Standard, C programming language has following predefined macros: __LINE__ Macro: __LINE__ macro contains the current line number of the program in the compilation. It gives the line number where it is called. It is used in generating log statements, error messages, throwing exceptions and debugging codes.
Several object-like macros are predefined; you use them without supplying their definitions. Here we explain the ones user programs often need to use. Many other macro names starting with ‘ __ ’ are predefined; in general, you should not define such macro names yourself.
11 Ιουν 2024 · Learn about the predefined preprocessor macros that MSVC supports for C and C++ languages, based on the ISO standards and the compiler options. See the list of standard and Microsoft-specific macros, their values, and examples.
These pages lists various pre-defined compiler macros that can be used to identify standards, compilers, operating systems, hardware architectures, and even basic run-time libraries at compile-time. For example, if we want to use a generic or opaque pointer type, we use void pointers.
Learn about the standard predefined macros that start with double underscores and are available with all compilers that implement the C language standards. See how they expand to provide information about the current file, line, date, time, compiler, and language version.
Learn about the standard, common, system-specific, and C++ named predefined macros in C. These macros are used without supplying their definitions and have various purposes and effects.
Learn how to use C preprocessor directives to define macros, include header files, and perform conditional compilation. See examples of predefined macros like __DATE__, __FILE__, __LINE__, and __TIME__.
