Functions

We’ll look at the following code to learn how to do functions in C and see what a C file should look like.

First, include stdint.h. See the section about header files.

In C the main() function returns an int. By default it returns 0. All C projects must contain one and only one main() function.

The function sum takes in a uint8_t array and its size and returns a uint32_t. In C you have to always pass the size of an array with the array.

The only difference with functions in C is that for the function to be recognized throughout the file it needs to have a function prototype as show above.