C Programming: Learn & Code

Learn the C language from your first printf to pointers, malloc and multi-file projects. This C programming course and tutorial pairs short lessons with a real compiler on your phone, so every concept ends with code you write, compile and run yourself.

Built for beginners, computer science students, embedded and systems developers, and anyone preparing for a C interview.

A C TUTORIAL THAT MAKES YOU WRITE C
• 39 C courses and 140+ short lessons, from the basics to pointers, memory and the standard library
• Every lesson mixes a little theory with hands-on practice in the editor
• Topics include operators, control flow, functions, arrays and strings, structs and unions, enums, recursion, bit manipulation, storage classes, the preprocessor, file handling, command-line arguments, string.h, math.h and dynamic arrays
• C quizzes and review sessions help the syntax stick

A C COMPILER IN YOUR POCKET
• Write C code in a mobile editor with a keyboard row for *, &, ->, %d, NULL and sizeof
• Compile and run it on a real C compiler and see the output, run time and memory use
• Type input for scanf programs in the interactive console
• Jump straight to the line an error points at
• Save your code, notes and examples for later

C LAB: PRACTICE THE HARD PARTS
• Memory Lab: watch the stack and the heap change line by line in 10 scenarios
• Segfault Hunt: a new buggy program every day. Find the defect and fix it
• Compile or Crash?: a 60-second quiz of 10 snippets. Does it compile, run or crash?
• Speed Arena: 6 problems where a correct answer is not enough, it has to be fast
• Build Series: write your own malloc, shell and grep, step by step
• Visual output: light up LEDs and a 7-segment display straight from printf

20 GUIDED C PROJECTS
Build real programs across multiple files: a linked list, an RPN calculator, a word counter, a config parser, a state machine, a generic stack with void *, a qsort comparator, fixed-point math, error codes, snprintf parsing and more. Each project compiles end to end.

C INTERVIEW PREP
• Mock Interview: an AI interviewer asks C questions, grades your answers and names what you missed
• 8 topics, from pointers and lifetime to undefined behaviour
• C interview questions to practice, plus a question of the day

AI MENTOR
Stuck on a pointer or a compiler error? Ask the AI Mentor and get a clear answer in plain language. The error translator turns cryptic compiler messages into a fix you can understand.

60 CODING MISSIONS AND DAILY CHALLENGES
• 60 C missions with code and terminal tasks
• A new coding problem every day
• World Coding Challenge: live global rounds every day with a leaderboard
• Streaks, XP and reminders keep your C practice going

FREE TO START
Your first C course is free. So are three missions, the daily Segfault Hunt, Compile or Crash?, the first Build Series, the first Memory Lab scenarios, one full mock interview and one AI Mentor question a day. No account is needed to begin.

PRO
Pro unlocks every course, mission and lab, the full AI tools, the certificate exam and an ad-free experience.

WHO IT IS FOR
• Beginners learning C as their first programming language
• Students taking a C programming class or a computer science course
• Developers moving into embedded systems or systems programming
• Anyone who wants a step-by-step C language tutorial they can follow on the bus

The app is available in 22 languages.

Start the free C language course today, take the first quiz and run your first C program in minutes.