What are Functions?
A function is a group of statements that together perform a task. Every C program has at least one function, which is main(), and all the most trivial programs can define additional functions.
You can divide up your code into separate functions. How you divide up your code among different functions is up to you, but logically the division is such that each function performs a specific task.
A function declaration tells the compiler about a function’s name, return type, and parameters. A function definition provides the actual body of the function.
The C standard library provides numerous built-in functions that your program can call. For example, strcat() to concatenate two strings, memcpy() to copy one memory location to another location, and many more functions.
A function can also be referred to as a method or a sub-routine or a procedure, etc.
Defining a Function
The general form of a function definition in C programming language is as follows −
return_type function_name( parameter list ) { body of the function }
A function definition in C programming consists of a function header and a function body. Here are all the parts of a function −
- Return Type
- Function Name
- Parameters
- Function Body
