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Learn C++

A free, interactive online C++ course. You write C++ on every lesson, with AI hints when the compiler yells at you, and a free certificate when you finish.

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View syllabusC++ playground

236,214+ codders enrolled

234 lessons207 challenges1,567 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 sections3 projects234 lessons207 challenges1,567 quiz questions
  1. Section 1

    Fundamentals

    Start sectionStartExpandCollapse    Build a strong foundation with essential concepts and basic skills74 lessons66 challenges444 questions1 project

    Introduction

    4 lessons425

    Variables Part 1

    6 lessons846

    Variables Part 2

    5 lessons334

    Operators Part 1

    7 lessons654

    Operators Part 2

    4 lessons423

    Decision Making

    6 lessons637

    Input/Output Basics

    5 lessons524

    Number Calculator

    Project4 lessons16

    Loops

    9 lessons760

    Functions

    7 lessons739

    Arrays Basics

    9 lessons848

    Strings

    5 lessons441

    Final Challenges

    3 lessons37
  2. Section 2

    Logic & Flow

    Start sectionStartExpandCollapse    Develop problem-solving skills and create dynamic, interactive programs56 lessons42 challenges293 questions2 projects

    Pointers and Memory

    8 lessons757

    Vectors (Dynamic Arrays)

    9 lessons861

    Project: Task List Tool

    Project5 lessons1

    Maps (Key-Value Pairs)

    7 lessons644

    Project: Inventory Tool

    Project5 lessons1

    Sets (Unique Elements)

    6 lessons538

    Advanced Functions

    7 lessons653

    Basic Error Handling

    6 lessons540

    Final Challenges

    3 lessons3
  3. Section 3

    Object Oriented Programming

    Start sectionStartExpandCollapse    Discover how to organize code with classes, objects, and reusable structures104 lessons103 challenges830 questions

    Fundamentals of OOP

    11 lessons1187

    Memory Management

    6 lessons644

    Constructors & Destructors

    9 lessons972

    Class Properties

    7 lessons753

    Encapsulation

    6 lessons651

    Operator Overloading

    8 lessons863

    Inheritance

    8 lessons862

    Polymorphism

    8 lessons860

    Templates

    6 lessons546

    STL Overview

    6 lessons646

    Advanced OOP Concepts

    7 lessons763

    Modern C++ Features

    7 lessons764

    Design Patterns Part 1

    6 lessons655

    Design Patterns Part 2

    7 lessons764

    Final Challenges

    2 lessons2

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

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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
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Certificate on completion

  • 14
  • 6
  • 1
See all 53 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
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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
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Why learn C++ with Coddy

  • Write and run real C++ code in your browser. No compiler install, no toolchain setup. Each lesson compiles your C++ server-side and shows the output instantly.
  • Modern C++: classes and objects, inheritance, virtual functions, references and pointers, templates, the STL. The C++ patterns you'd actually use today.
  • AI hints help you read and fix C++ compiler errors - notoriously cryptic ones especially - so the language feels approachable instead of punishing.
  • Free C++ certificate when you finish. Useful for systems, game-dev, and embedded roles where C++ fluency is a baseline expectation.

Frequently asked questions about learning C++

Is C++ hard to learn?

C++ has a reputation for being one of the harder languages to learn - pointers, manual memory management, and a sprawling feature set all add up. The good news is you don't need every feature on day one. The course starts with the practical core (variables, control flow, functions, classes) and introduces pointers and templates only after the basics are solid.

Should I learn C or C++ first?

Both teach low-level thinking, but they lead in different directions. C is smaller and forces you to confront memory and pointers immediately. C++ is larger but supports a more gradual ramp through classes and the STL before you have to manage memory by hand. For application or game development, start with C++; for embedded or OS work, C is closer to the metal.

How long does it take to learn C++?

C++ basics - syntax, control flow, functions, simple classes - take three to six weeks of daily practice. Comfortable use of pointers, templates, and the STL usually takes three to six months. Mastery (modern C++ idioms, performance work, complex codebases) is a multi-year arc.

Can I learn C++ online for free?

Yes. The interactive C++ course is free - lessons, coding exercises, quizzes, and a certificate. The editor runs in your browser, so you don't need to install GCC, Clang, or Visual Studio locally to start writing C++.

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

No. Every C++ exercise compiles server-side in a sandboxed environment and shows the output next to your code. No toolchain, no makefile, no IDE.

Do I get a C++ certificate after the course?

Yes. Finishing the C++ course gives you a free certificate of completion. A verifiable proof point you can add to your resume or LinkedIn alongside portfolio code.
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Learn C++ with Coddy

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