What are the predefined macros?

What are the predefined macros?

3.7 Predefined Macros Several object-like macros are predefined; you use them without supplying their definitions. They fall into three classes: standard, common, and system-specific. In C++, there is a fourth category, the named operators. They act like predefined macros, but you cannot undefine them.

What is predefined macros in C?

C Predefined Macros

No.	Macro	Description
1	_DATE_	represents current date in “MMM DD YYYY” format.
2	_TIME_	represents current time in “HH:MM:SS” format.
3	_FILE_	represents current file name.
4	_LINE_	represents current line number.

Where are Visual Studio macros stored?

A user-defined macro is stored in a property sheet. If your project doesn’t already contain a property sheet, you can create one by following the steps under Share or reuse Visual Studio project settings.

What is __ func __?

(C++11) The predefined identifier __func__ is implicitly defined as a string that contains the unqualified and unadorned name of the enclosing function. __func__ is mandated by the C++ standard and is not a Microsoft extension.

Which is the invalid predefined macro as per ANSI C?

12) Select the invalid predefined macro as per ANSI C. The correct option is (c). Explanation: There is no such macro defined with the name __C++__, but the __cplusplus__ is predefined macro as per ANSI C specification.

What does __ LINE __ return?

The __LINE__ This macro can find the current line number in source file.

Does clang define _msc_ver?

For compatibility with existing code that compiles with MSVC, clang defines the _MSC_VER and _MSC_FULL_VER macros. These default to the values of 1800 and 180000000 respectively, making clang look like an early release of Visual C++ 2013.

Which of the following is predefined function in C?

1) Predefined standard library functions Functions such as puts() , gets() , printf() , scanf() etc are standard library functions. These functions are already defined in header files (files with . h extensions are called header files such as stdio. h ), so we just call them whenever there is a need to use them.

What is Stdc C?

2 correct, STDC is used to mark the beginning of standard compiler commands. Compilers are free to add their own pragma commands. A standard compliant compiler is supposed to look for STDC after each #pragma in the preprocessing phrase.

Why macros are used in C?

The Concept of C Macros Macros are generally used to define constant values that are being used repeatedly in program. Macros can even accept arguments and such macros are known as function-like macros. It can be useful if tokens are concatenated into code to simplify some complex declarations.

What is the need for pre processor in C What are the basic functions of a pre processor?

The preprocessor provides the ability for the inclusion of header files, macro expansions, conditional compilation, and line control. In many C implementations, it is a separate program invoked by the compiler as the first part of translation.

What are predefined macros in MSVC?

Predefined Macros. The Microsoft C/C++ compiler (MSVC) predefines certain preprocessor macros, depending on the language (C or C++), the compilation target, and the chosen compiler options. MSVC supports the predefined preprocessor macros required by the ANSI/ISO C99 standard and the ISO C++14 and C++17 standards.

What are predefined macros in C++?

Predefined Macros. Unless noted, the macros are defined throughout a translation unit as if they were specified as /D compiler option arguments. When defined, the macros are expanded to the specified values by the preprocessor before compilation. The predefined macros take no arguments and cannot be redefined.

Can I use ANSI C predefined macros in resource scripts?

Thank you. RC does not support the ANSI C predefined macros ( __DATE__, __FILE__, __LINE__, __STDC__, __TIME__, __TIMESTAMP__ ). Therefore, you cannot include these macros in header files that you will include in your resource script.

How do I use the Macros provided by NMAKE in inference?

NMAKE provides several special macros to represent various filenames and commands. One use for some of these macros is in the predefined inference rules. Like all macros, the macros provided by NMAKE are case sensitive. Filename macros are predefined as filenames specified in the dependency (not full filename specifications on disk).