Menu Close

What are the standard predefined macros?

Admin

What are the standard predefined macros?

Standard predefined macros

  • __cplusplus Defined as an integer literal value when the translation unit is compiled as C++.
  • __DATE__ The compilation date of the current source file.
  • __FILE__ The name of the current source file.
  • __LINE__ Defined as the integer line number in the current source file.

What are the standard predefined macros in C?

Predefined Macros in C with Examples

  • __LINE__ Macro: __LINE__ macro contains the current line number of the program in the compilation.
  • __FILE__ Macro: __FILE__ macro holds the file name of the currently executing program in the computer.

What is macro in C explain with example?

A macro is a fragment of code which has been given a name. Whenever the name is used, it is replaced by the contents of the macro. Object-like macros resemble data objects when used, function-like macros resemble function calls. You may define any valid identifier as a macro, even if it is a C keyword.

What are the types of macro?

There are two types of macros:

  • Object-like Macros.
  • Function-like Macros.

What are the most common predefined macros?

The common predefined macros are GNU C extensions. They are available with the same meanings regardless of the machine or operating system on which you are using GNU C or GNU Fortran. Their names all start with double underscores. This macro expands to sequential integral values starting from 0.

Where macros are stored in C?

Macros are not stored in memory anywhere in the final program but instead the code for the macro is repeated whenever it occurs. As far as the actual compiler is concerned they don’t even exist, they’ve been replaced by the preprocessor before they get that far.

What is use of macros in C?

In C, the macro is used to define any constant value or any variable with its value in the entire program that will be replaced by this macro name, where macro contains the set of code that will be called when the macro name is used in the program.

What are the two types of macros?

Types of macros

  • Executive macros.
  • Declarative macros.

What are macros programming?

A macro (which stands for “macroinstruction”) is a programmable pattern which translates a certain sequence of input into a preset sequence of output. Macros can make tasks less repetitive by representing a complicated sequence of keystrokes, mouse movements, commands, or other types of input.

What is macros in C language?

Macros and its types in C/C++ A macro is a piece of code in a program that is replaced by the value of the macro. Macro is defined by #define directive. Whenever a macro name is encountered by the compiler, it replaces the name with the definition of the macro.

What do you need to know about word macros?

What is a Word macro? Macros are considered a standard feature in programming as well as the use of computer programs. They are basically subprograms that developers and users can create to save sequences of commands or operating instructions, which can then be started with a simple action.

What are the 4 main types of macros?

There are 4 main types of macros that have a range of functions; Standard Macro, Analytic App, Batch Macro and Iterative Macro. Each blog in this series will explain how to create each type of macro and provide a couple of practical use cases.

Which is the version number of a macro in C?

Generally, the value is set to 1. __STDC_VERSION__: This macro holds the C Standard’s version number in the form yyyymmL where yyyy and mm are the year and month of the Standard version. This signifies which version of the C Standard the compiler conforms to. The value 199409L signifies the C89 standard amended in 1994.

When do you use a macro in C?

__cplusplus: __cplusplus Macro is defined when the C++ compiler is used. It is used to test whether a header is compiled by a C compiler or a C++ compiler. This macro gives value similar to __STDC_VERSION__, in that it expands to a version number. __OBJC__ Macro:: __OBJC__ Macro has value 1 if the Objective-C compiler is in use.

https://www.youtube.com/watch?v=TD8E9e0GykY