What is a macros in C++ programming?

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.

Are there macros in C++?

99.9% of the C++ programs use macros. Unless you are making a basic file you have to write #include, which is a macro that pastes the text contained in a file.

How are macros defined?

A macro is an automated input sequence that imitates keystrokes or mouse actions. A macro is typically used to replace a repetitive series of keyboard and mouse actions and used often in spreadsheets and word processing applications like MS Excel and MS Word. The file extension of a macro is commonly .

How do you write a macro in C++?

The naïve way to write the macro is like this: #define MACRO(X,Y) \ cout << “1st arg is:” << (X) << endl; \ cout << “2nd arg is:” << (Y) << endl; \ cout << “Sum is:” << ((X)+(Y)) << endl; This is a very bad solution which fails all three examples, and I shouldn’t need to explain why.

Why are macros 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 macro substitution in C++?

The #define directives specifies a macro, comprising an identifier name and a string or numerics, to be substituted by the preprocessor for each occurance of that macro in the source code. …

What is macro example?

Macro is defined as something that covers a large amount, or is large in size. An example of macro is the study of the key driving aspects of an economy; macro economics. An example of macro is a very close up photograph of an ant; a macro photograph.