Custom Data Types & Object-Oriented Programming in C

An interactive lab for embedded engineers. Visualize memory, simulate bugs, explore design patterns — all in the browser, no setup required.

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Learning roadmap

1

Why custom types?

Data grouping, state tracking, and the limits of raw types.
2

Custom types deep-dive

typedef, enum, struct, union — and the tagged-union pattern.
3

Struct memory lab

Alignment, padding, packed structs, and six memory bugs.
4–5

OOP in C

Objects, methods, self, encapsulation, and opaque handles.
6–7

Polymorphism

Function pointers, ops tables, callbacks, and composition.
8

Pitfalls

20 interactive warnings: the things C will not protect you from.
9

Design playground

Assemble your own design and study the generated C listing.
10

Final quiz

14 shuffled questions across every module.