Functions in C

Functions in C are not much different from functions in JavaScript. Probably the most notable difference, at least from a syntactic point of view, is that you need to specify types on all your variables and input parameters, along with needing to specify the return type of the function. Remember, C is a strongly typed language, as opposed to JavaScript which is a loosely typed language where types are entirely inferred by the interpreter. The C compiler ensures that you specify your types and that your code is consistent with the types you specify.

Here is a non-comprehensive list of C data types: https://www.le.ac.uk/users/rjm1/cotter/page_22.htm

To reiterate, you might declare a function in C like this:

    int foo(int param1, int param2)
    {
        ...
        return 0;
    }

This function signature states that it receives two integer parameters and returns an integer.

Here's another example:

    void bar(int[])
    {
        ...
    }

This function signature states that it receives a single integer array and doesn't return anything. You'll often see this kind of function signature when you want the function to simply mutate the input and/or print the contents of the input.

For printing output, you'll want to use the printf function, which is included in the stdlib library.

Implementing fizzbuzz

Your first task is going to be writing good ol' fizzbuzz in C! Your fizzbuzz function should receive some integer n, then loop up till n, printing out "Fizz" if the current iteration i is divisible by 3, "Buzz" if it's divisible by 5, or "FizzBuzz" if it is divisible by both 3 and 5. Additionally, for each iteration where nothing is printed, your function should increment a counter and return the result of that counter at the end of its execution.

Navigate to the fizzbuzz.c file. You'll write your code in there. When you want to test it, type make tests into your terminal (make sure you're doing this from the directory where the Makefile is located), which will run the Makefile and compile your program and, if the compilation was successful, run the tests for it as well.