writing functions

In C programming, functions are used to encapsulate a block of code that performs a specific task. Functions allow you to break down your program into smaller, modular units, making your code more organized, reusable, and easier to maintain. Here's how you can write functions in C:

1. Function Declaration:   The function declaration specifies the name of the function, the type of data it returns (if any), and the types of parameters (if any) it accepts. It is usually placed at the beginning of the file or in a header file.

2. Function Definition:   The function definition provides the implementation of the function. It consists of the function header (return type, function name, and parameter list) followed by the function body enclosed in curly braces `{}`.

3. Function Call:   To use a function, you need to call it from within your code. When a function is called, the program jumps to the function definition, executes the code inside the function body, and returns to the point where the function was called.

4. Function Prototypes (Optional):   Function prototypes are used to declare the functions before they are defined. It provides the compiler with information about the function's name, return type, and parameter types. Prototypes are typically placed at the beginning of the file or in a header file.