What is __ func __ in C?

What is __ func __ in C?

Predefined Identifier __func__ in C Identifier is the name given to an entity in programming to identify it in the program. static const char __func__[] = “function-name”; appeared, where function-name is the name of the lexically-enclosing function.”

What does __ LINE __ return?

__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.

What is the data type of macro in C?

In C, function-like macros are much similar to a function call. In this type of macro, you can define a function with arguments passed into it. TechVidvan Tutorial: Macros with arguments! In the above example, the compiler finds the name of the macro (AREA(a)) and replaces it with the statement (a*a).

What is __ Time __ in C?

__TIME__ is a preprocessor macro that expands to current time (at compile time) in the form hh::mm::ss in 24 hour time (e.g. “22:29:12”), as a string. The __TIME__ macro can be used to provide information about the particular moment a binary was built.

What is __ LINE __ in C?

__LINE__ is a preprocessor macro that expands to current line number in the source file, as an integer. __LINE__ is useful when generating log statements, error messages intended for programmers, when throwing exceptions, or when writing debugging code.

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.

What does __ FILE __ mean in C?

__FILE__ This macro expands to the name of the current input file, in the form of a C string constant. This is the path by which the preprocessor opened the file, not the short name specified in ‘ #include ‘ or as the input file name argument. For example, “/usr/local/include/myheader.

Where is __ Va_args __ defined?

The C standard mandates that the only place the identifier __VA_ARGS__ can appear is in the replacement list of a variadic macro. It may not be used as a macro name, macro argument name, or within a different type of macro. It may also be forbidden in open text; the standard is ambiguous.

What is macro explain the types of macro?

A macro is a segment of code which is replaced by the value of macro. Macro is defined by #define directive. There are two types of macros: Object-like Macros. Function-like Macros.

What is macro data type?

Below is a list of common VBA variables (known as data types) used in macros and their purposes: Integer: Used to store number values that won’t take on decimal form. Single: Used to store number values that may take on decimal form. Double: A longer form of the single variable.

What type is __ LINE __?

What is the output of C program?

When we say Output, it means to display some data on screen, printer, or in any file. C programming provides a set of built-in functions to output the data on the computer screen as well as to save it in text or binary files.

What is a macro in C with example?

This macro is similar to a function call in C programming language. In this, a function name is defined with arguments passed to the function. In the above example, we can function named “ADD” is defined to perform the addition of two numbers “p” and “q”.

How do you define a function like a macro?

Function-like macros can take arguments, just like true functions. To define a macro that uses arguments, you insert parameters between the pair of parentheses in the macro definition that make the macro function-like. The parameters must be valid C identifiers, separated by commas and optionally whitespace.

What is the difference between macro and named operator in C++?

However, the preprocessor operator defined (see section 4.2.3 Defined) can never be defined as a macro, and C++’s named operators (see section 3.7.4 C++ Named Operators) cannot be macros when you are compiling C++. [? ] An object-like macro is a simple identifier which will be replaced by a code fragment.

What is the C preprocessor?

The C preprocessor is also known as a macro preprocessor. The macro in C can be defined as a set of program statements is given a name and this name is used whenever these set of code has to be used. These macros always start with symbol “#” and the statements staring with this symbol are invoked by the compiler.