Programming C without variables is like, well, programming C without variables. They are so essential to the language that it doesn’t even require an analogy here. We can declare and use them… ...

What is abstract data type in C? Abstract data types (often written ADT for short) are data types whose implementation details are hidden from user view for the data structure, but ADTs can be ...

And they’re useless if you want to combine different data types together. Luckily, C provides us with proper alternatives out of the box.

Conveniently, some of C’s features, both in the language and the pre-processor, can be co-opted into providing Modula-like capabilities. These features, in conjunction with a set of conventions, make ...