Learn C from scratch — pointers and memory, finally made clear
A hands-on C course for complete beginners. You write real C in the browser and it is compiled and run for you — no toolchain to install, no cryptic errors on day one. Short interactive lessons introduce each idea; coding challenges make it stick. Three whole topics are given to pointers and memory, because that is what makes C, C.
#include <stdio.h>
int main(void) {
printf("Hello, C!\n");
for (int i = 1; i <= 5; i++)
printf("%d squared is %d\n", i, i * i);
return 0;
}Why learn C here
Every other language is built on it
Operating systems, databases, Python itself — all written in C. Learn it and the machine stops being a black box: you see the memory, the bytes and the cost of every line you write.
Pointers, taught properly
Most courses rush pointers in one lesson. Here they get three — addresses, array decay, and dynamic memory — each with animated pictures you drive yourself. You finish able to read C, not just write it.
The habits that keep C safe
C does not check your array index or your integer overflow. The final chapter is entirely about undefined behaviour and the "check before you act" discipline that professional C is written with.
The syllabus — 8 chapters, in order
Each chapter is a set of short interactive lessons, then coding challenges you submit to a real judge before moving on.
- 01Getting Started
- 02Decisions & Loops
- 03Arrays
- 04Functions & Recursion
- 05Working with Text
- 06Pointers & Memory
- 07Structs
- 08Real-World C
What you can do by the end
- Write and compile C — printf, scanf, variables and types
- Control flow with if/else, for and while loops
- Work with arrays and write the small algorithms C makes you write yourself
- Write functions, recursion, and sort with qsort
- Handle C strings and the null terminator with confidence
- Understand pointers, array decay, and malloc/free without fear
- Build your own types with structs, and sort tables of records
- Recognise undefined behaviour before it bites
How the course works
Read a short lesson
One idea at a time, written for a beginner — with worked examples and quick-check questions, not a video to scrub through.
Write real C
Every lesson ends in an in-browser editor. Nothing to install — you write C and press run.
A real judge checks it
Your code is compiled and run against hidden tests, so you know it actually works instead of guessing.
C from scratch — questions people ask
How do I learn C from scratch?
Start with printing, variables and loops, then build up through arrays, functions and strings before taking on pointers and memory, writing code at every step. This course is that path: eight chapters of interactive lessons and 60 coding challenges, each compiled and tested by a real judge.
Is this C course free?
You can start for free with no card. A free account opens the interactive workspace and the first lessons; one membership then unlocks the whole C course plus the C++, Python, Java and JavaScript courses and the full DSA course.
Do I need to install a compiler?
No. Your code is compiled with GCC and run for you in the browser, so there is nothing to set up and nothing to configure.
Are pointers really that hard?
They are hard when they are explained in one lesson with no pictures. This course gives them a whole chapter of three topics, starting from "a variable lives at an address" and building up to malloc and free, with animated diagrams you step through yourself.
Should I learn C or C++ first?
C is smaller — no classes, no templates, no standard library of containers — so there is less to hold in your head while the fundamentals land. Learn C first and C++ becomes an extension rather than a new language. Both courses are in the same membership, so you do not have to choose.
Will I get a certificate?
Yes. Completing the course issues a certificate with a public verification link an employer can check.
Also included in your membership
One membership unlocks every course — switch between them whenever you like. Nothing here is sold separately.
Start C today — free
A free account opens the workspace and the first lessons, no card. One membership then unlocks this course and every other — $49 a year (international price; the price for your region is shown at checkout).