what is macro in c

In C programming, a macro is a piece of code defined with the help of the #define directive. Macros are used to replace a piece of code with a single value of the macro, which can be very useful in writing robust and scalable code. Macros can be defined using the #define directive, and they are not terminated by a semicolon. Whenever the compiler encounters a macro in a program, it replaces it with the macro value. There are different types of macros, including object-like macros, function-like macros, and chain-like macros. Object-like macros are simple identifiers that will be replaced by a code fragment, while function-like macros work in a similar way as a function call. Macros can have odd effects if their arguments perform side-effects, so it is generally best to avoid side-effects in macro argumentsMacros.html).