Document for Functions
Functions are an essential concept in programming languages like C. They are used to break down a large program into smaller, more manageable pieces of code. Below is a detailed explanation of functions and their importance in programming.

What are Functions?
Functions in C are blocks of code that perform a specific task. They are designed to be reusable and modular, allowing for easier maintenance and debugging of code. Functions typically take input parameters, perform some operations, and return a result.

Key Points:
- Functions help in organizing code and making it more readable.
- They promote code reusability and modularity.
- Functions can be called multiple times from different parts of the program.

Defining Functions
In C, a function is defined with a return type, name, and parameters. The return type specifies the type of value the function will return, while parameters are inputs to the function. Here's an example of a function definition in C:
c
int add(int a, int b) {
return a + b;
}

Key Points:
- The function `add` takes two integer parameters `a` and `b` and returns their sum.
- The return type `int` specifies that the function will return an integer value.

Calling Functions
To use a function in C, we need to call it by its name and pass the required arguments. Here's how we can call the `add` function defined above:
c
int result = add(5, 3);

Key Points:
- The function `add` is called with arguments `5` and `3`.
- The result of the function call is stored in the variable `result`.
In conclusion, functions are a fundamental concept in programming languages like C. They help in organizing code, promoting reusability, and making programs more modular. Understanding how to define and call functions is crucial for writing efficient and maintainable code.