# Function Basics — C Programming

Source: https://www.geekswithgeeks.com/en/c/c-functions-basics

> Package reusable logic into named blocks.

## Why functions?

A **function** is a named block of code you can call repeatedly instead of copy-pasting. It takes inputs (parameters), does work, and can send back a result (return value).

## Anatomy of a function

Every function has a return type, a name, a parameter list, and a body.

```c
int add(int a, int b) {
    int sum = a + b;
    return sum;
}

int main(void) {
    int result = add(3, 4);
    printf("%d\n", result);
    return 0;
}
```

Output:

```
7
```

## void means nothing

A function that returns nothing uses `void` as its return type. `void greet(void) { printf("Hi\n"); }`