https://learn-c.net/ Free C tutorials, plus a catalogue of the memory-safety bugs language models reliably introduce in C, and how to catch them. Sun, 06 Sep 2026 03:07:12 GMT https://learn-c.net/hello-world/https://learn-c.net/hello-world/The C programming language is a general purpose programming language, which relates closely to the way machines work. https://learn-c.net/ai/agent-setup/https://learn-c.net/ai/agent-setup/In C the review is not optional, so the setup is about making the machine do as much of it as possible. https://learn-c.net/review/failure-modes/https://learn-c.net/review/failure-modes/In most languages a generated bug is a wrong answer. In C it is a vulnerability. This is the catalogue, and the tooling that makes it survivable. https://learn-c.net/variables-and-types/https://learn-c.net/variables-and-types/C has several types of variables, but there are a few basic types: The different types of variables define their bounds. https://learn-c.net/arrays/https://learn-c.net/arrays/Arrays are special variables which can hold more than one value under the same variable name, organised with an index. https://learn-c.net/review/dependencies/https://learn-c.net/review/dependencies/No registry means no slopsquatting — and also no lockfile, no audit command, and no automatic way to learn that the library you vendored in 2022 has a CVE. https://learn-c.net/ai/agents-md/https://learn-c.net/ai/agents-md/The one language where the instructions file should be blunt, specific, and mostly about memory — because the compiler will happily accept everything it forbids. https://learn-c.net/ai/tokenomics/https://learn-c.net/ai/tokenomics/Nobody calls a hosted model from C. If C is in your stack, you are running the model — and the currency is not tokens, it is bytes moved per second. https://learn-c.net/multidimensional-arrays/https://learn-c.net/multidimensional-arrays/In the previous tutorials on Arrays, we covered, well, arrays and how they work. https://learn-c.net/review/security/https://learn-c.net/review/security/The memory bugs have their own catalogue. This is the rest of the threat model: input you did not validate, privilege you did not drop, and races you did not know were there. https://learn-c.net/conditions/https://learn-c.net/conditions/In life, we all have to make decisions. In order to make a decision we weigh out our options and so do our programs. https://learn-c.net/review/performance/https://learn-c.net/review/performance/In C the compiler is a better optimiser than you are, so the interesting problems are the ones it cannot fix: memory layout, allocation in hot loops, and asking the wrong question. https://learn-c.net/strings/https://learn-c.net/strings/Strings in C are actually arrays of characters. https://learn-c.net/for-loops/https://learn-c.net/for-loops/For loops in C are straightforward. They supply the ability to create a loop - a code block that runs multiple times. https://learn-c.net/while-loops/https://learn-c.net/while-loops/While loops are similar to for loops, but have less functionality. https://learn-c.net/functions/https://learn-c.net/functions/C functions are simple, but because of how C works, the power of functions is a bit limited. https://learn-c.net/static/https://learn-c.net/static/static is a keyword in the C programming language. It can be used with variables and functions. By default, variables are local to the scope in which they are defined. https://learn-c.net/enums-typedef-const/https://learn-c.net/enums-typedef-const/Three small features that decide how readable a C codebase is — and one of them is your only real defence against accidental mutation. https://learn-c.net/pointers/https://learn-c.net/pointers/Pointers are also variables and play a very important role in C programming language. They are used for several reasons, such as: And many more. https://learn-c.net/structures/https://learn-c.net/structures/C structures are special, large variables which contain several named variables inside. Structures are the basic foundation for objects and classes in C. https://learn-c.net/function-arguments-by-reference/https://learn-c.net/function-arguments-by-reference/Assumingly you’re already know pointers and functions, so you are aware of that function arguments are passed by value, which means they are copied in and out of functions. https://learn-c.net/dynamic-allocation/https://learn-c.net/dynamic-allocation/Dynamic allocation of memory is a very important subject in C. It allows building complex data structures such as linked lists. https://learn-c.net/arrays-and-pointers/https://learn-c.net/arrays-and-pointers/In a previous tutorial on [[Pointers]], you learned that a pointer to a given data type can store the address of any variable of that particular data type. https://learn-c.net/recursion/https://learn-c.net/recursion/Recursion occurs when a function contains within it a call to itself. Recursion can result in very neat, elegant code that is intuitive to follow. https://learn-c.net/linked-lists/https://learn-c.net/linked-lists/Linked lists are the best and simplest example of a dynamic data structure that uses pointers for its implementation. https://learn-c.net/binary-trees/https://learn-c.net/binary-trees/A Binary Tree is a type of data structure in which each node has at most two children (left child and right child). https://learn-c.net/unions/https://learn-c.net/unions/C Unions are essentially the same as C Structures, except that instead of containing multiple variables each with their own memory a Union allows for multiple names to the same variable. https://learn-c.net/pointer-arithmetics/https://learn-c.net/pointer-arithmetics/You previously learned what is a pointer and how to manipulate pointers. In this tutorial you will be learning the arithmetic operations on pointers. https://learn-c.net/function-pointers/https://learn-c.net/function-pointers/Remember pointers? We used them to point to an array of chars then make a string out of them. https://learn-c.net/bitmasks/https://learn-c.net/bitmasks/Bit masking is simply the process of storing data truly as bits, as opposed to storing it as chars/ints/floats.