In this post, we are going to understand between macro and . But before getting started, I want to explain little bit about macro and to you in an easy way.

What is a function?

A function can be stated as a group of statements that performs some kind of task. In every C program, you’ll notice at least one function that is main() function. The execution of the program starts from there only. You can divide your code into smaller functions for reducing the of the body of main() function.

Now let us see the syntax of a function.

What is a macro?

Macros are used to define symbolic constants. It is a preprocessor directive, which means it replaces itself with the value which is given to it. Let us understand it with an example.

The output of the above code is:

Hope you’ve got an idea of macro and its use.

Difference between Macro and Function

Macro Function
It is not compiled, it is pre-processed. It is not pre-processed but it is compiled.
Macros do not check for compilation error which leads to unexpected output. Function checks for compilation error and there is a less chance of unexpected output.
Code length is increased. Code length remains same.
Macros are faster in execution than function. Functions are bit slower in execution.
Before compilation process the macro name is replaced by the macro value. In a function call, transfer of control takes place.
Macros are useful when a piece of code used multiple times in a program. Functions are helpful when a large piece of code repeated number of times.

Comment below if you have queries regarding above for difference between macro and function.

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