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Learn C Programming

A free, interactive online C course. You write C on every lesson, with AI hints when something segfaults, and a free certificate when you finish.

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View syllabusC playground

132,102+ codders enrolled

187 lessons164 challenges1,042 quiz questions

  • Beginner friendly
  • sparkles iconAI-assisted coding help
  • hint iconHands-on interactive lessons
  • volume On iconAudio narration on every lesson
  • quiz iconQuizzes to test your knowledge
  • certificate iconFree certificate of completion

Syllabus

3 sections4 projects187 lessons164 challenges1,042 quiz questions
  1. Section 1

    Fundamentals

    Start sectionStartExpandCollapse    Build a strong foundation with essential concepts and basic skills63 lessons79 challenges381 questions

    Introduction

    4 lessons426

    Variables

    11 lessons1485

    Operators

    9 lessons1161

    Control Flow

    7 lessons944

    Input & Output

    5 lessons626

    Loops

    9 lessons1053

    Functions

    7 lessons1039

    Arrays

    8 lessons1247

    Final Challenges

    3 lessons3
  2. Section 2

    Logic & Flow

    Start sectionStartExpandCollapse    Master advanced C programming with a focus on data structures and flow control. Learn to work with complex arrays, collections, error handling, and time management.63 lessons52 challenges345 questions2 projects

    Pointers Fundamentals

    6 lessons540

    Pointers and Arrays

    5 lessons531

    Character Arrays and Strings

    8 lessons858

    Project: Simple Text Utility

    Project5 lessons1

    Pointers and Functions

    6 lessons641

    Memory Management

    7 lessons652

    Structures (structs)

    6 lessons540

    Structs and Pointers

    6 lessons643

    Project: Simple Contact Entry

    Project5 lessons1

    Enums and Typedef

    6 lessons640

    Final Recap Challenges

    3 lessons3
  3. Section 3

    Object Oriented Programming

    Start sectionStartExpandCollapse    Discover how to organize code with classes, objects, and reusable structures61 lessons50 challenges316 questions2 projects

    Modular Programming Basics

    5 lessons433

    Objects and Methods

    6 lessons642

    Object Lifecycle

    5 lessons533

    Encapsulation

    5 lessons435

    Project: Simple Bank Account

    Project6 lessons1

    Inheritance via Composition

    5 lessons531

    Function Pointers

    5 lessons534

    Polymorphism

    6 lessons641

    Project: Shape Drawer

    Project5 lessons1

    Generic Containers

    5 lessons534

    Design Patterns in C

    4 lessons425

    Final Challenges

    4 lessons48

C courses

Hands-on C courses, free to start in your browser.

Interview PreparationData StructuresGraph Algorithms Courses

Beginner Challenges - Practice Basic Concepts

Popular

Put your beginner coding knowledge to test and try to solve this programming challenges, use any language you want, Happy Coding!

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Certificate on completion

  • 20
  • 20

Coding Problems

Popular

Put your programming problem solving skills to the test using the exercises with different difficulties in this course. Designed for coders with some prior knowledge of the basic syntax in any programming language.

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Certificate on completion

  • 32
  • 31

Stack - Data Structures Series #1

In this course, you will learn about the Stack data structure, create a Stack from zero using your preferred language, and practice coding challenges with it!

Data Structures
  • 13
  • 6
  • 1

Coding Problems: Volume 2

Put your programming problem solving skills to the test using the exercises with different difficulties in this course. Designed for coders with some prior knowledge of the basic syntax in any programming language. This course is an extension of the first Coding Problems

certificate icon

Certificate on completion

  • 25
  • 24

Hash Tables - Data Structures Series #4

In this course, you will learn about the Hash Table data structure, create a Hash Table from zero using your preferred language, and practice coding challenges with it!

Data Structures
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Certificate on completion

  • 14
  • 12

Linked List - Data Structures Series #5

In this course, you will learn about the Linked List data structure, create a Linked List from zero using your preferred language, and practice coding challenges with it!

Data Structures
certificate icon

Certificate on completion

  • 14
  • 6
  • 1
See all 45 C courses →
What you get
Everything you'll use to learn to code

Learn by Doing

Write real code, query databases, build websites, and master AI prompts. Our interactive lessons cover every skill modern developers need.

playground.js
Code Editor
1const greeting = "Hello, Coddy!"
2function sayHi(name) {
3    return greeting + " " + name
4}
5
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Test #3test Case Failure icon
Input
"Alex"
Output
"Hello, Coddy! Alex"

Build Your Coding Streak

Stay consistent and watch your progress grow! Track your daily coding habit, protect your streak with freeze days, and earn rewards for showing up every day.

12 days streak

Return tomorrow to keep your streak!

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Double or Nothing

Day 5 of 7

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Code Anywhere, Anytime

Take your coding journey on the go! No setup, no downloads - just open and start coding. Available on iOS, Android and Web with 4.9 star ratings.

Python
7Streak
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5Energy
Variables
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CONTINUE
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Journey
Goals
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4.9
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Rating

You're Not Alone in This

Compete on global leaderboards, invite friends to earn rewards, and celebrate each other's wins. Coding is better with friends!

Challenger League
Challenger LeagueTop 7 advance
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Alex7+ Days
2840
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Jordan7+ Days
2650
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Sam7+ Days
2420
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Casey
2180
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Morgan7+ Days
1950
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Every way to learn

Read, listen, test yourself, ask the AI, or look up anything you've already covered. Every lesson meets you where you are.

Intro to Variables
Audio

A variable is a named container that stores a value you can reference later in your program.

In Python, you create one by writing the name, an equals sign, then the value you want to store.

The value can change over time - reassigning the name simply points it to a new value.

1xSarah

Prove Your Skills

Earn certificates for every course you complete. Add them to your LinkedIn profile and resume to showcase your coding expertise to employers.

CoddyCertificate of Completion
This certifies thatJohn Doehas successfully completed
PythonPython Fundamentals
Verified
DateJan 2026
LinkedInAdd to LinkedIn

Why learn C with Coddy

  • Write and run real C code in your browser. No GCC install, no Makefile, no toolchain setup. Each exercise compiles your C program server-side and shows the output instantly.
  • C the way it's actually used: pointers and references, arrays, strings, structs, dynamic memory with malloc and free, file I/O. The C foundations every systems programmer needs.
  • AI hints help you read and fix C compiler errors and segfaults so the language feels approachable instead of cryptic from day one.
  • Free C programming certificate when you finish the course. A credible signal for systems, embedded, OS, and game-engine roles where C fluency is expected.

Frequently asked questions about learning C

Is C hard to learn?

C has a smaller feature set than most modern languages, but it makes you confront pointers and manual memory management early - which is why it has a reputation for being difficult. The course introduces those ideas one step at a time, with hands-on exercises after every concept, so the hard parts don't all hit at once.

Should I learn C or C++ first?

For embedded, OS-level, or low-level systems work, start with C - it's smaller and closer to the metal. For application development, game engines, or modern systems work, C++ is the more common choice and gives you a gentler ramp through classes before you have to manage memory by hand.

How long does it take to learn C programming?

C basics - variables, conditionals, loops, functions - take two to four weeks of daily practice. Becoming comfortable with pointers, structs, and dynamic memory usually takes another one to three months. Mastery (system-level code, performance work, large C codebases) is a multi-year arc.

Can I learn C programming online for free?

Yes. The interactive C course is free - full lessons, coding exercises, quizzes, and a certificate of completion. The C compiler runs server-side, so you don't need to install GCC, Clang, or any IDE locally to start writing C.

Do I need to install a C compiler to take this course?

No. Every C exercise compiles in a sandboxed environment and shows the output next to your code. There's no Makefile, no IDE, no toolchain to configure.

Do I get a certificate after the C programming course?

Yes. Finishing the C programming course gives you a free certificate of completion you can add to your resume or share on LinkedIn - useful alongside any systems-programming projects or GitHub repos you've built.
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Learn C with Coddy

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