🚀 C++ Complete Guide

280 Production-Quality Programs — From Fundamentals to Expert Systems

Quick Start • Curriculum • Key Features • Compilation • Structure • Contributing

---

📋 Overview

C++ Complete Guide is a comprehensive, best-practice collection of 280 C++20 programs spanning 23 phases. Each program is a self-contained, compilable unit with:

• 📖 In-depth theory with code comments
• 💻 Complete, compilable C++20 code using modern idioms
• 📊 Sample input/output for immediate understanding
• ⏱ Time & space complexity analysis
• ❓ Common interview questions with answers
• ⚠️ Common mistakes and how to avoid them

From Hello World to a Transformer implementation, Trading Matching Engine, Compiler front-end, and a Production-Grade Backend Framework — this guide bridges the gap between learning syntax and building production systems.

---

🚀 Quick Start

git clone https://github.com/your-org/cpp-complete-guide.git
cd cpp-complete-guide

# Compile any program
g++ -std=c++20 -Wall -Wextra -O2 Phase_01_Basics/01_HelloWorld.cpp -o hello
./hello

# Compile networking programs (macOS/Linux)
g++ -std=c++20 -Wall -Wextra Phase_21_Networking/249_TCP_Client.cpp -o tcp_client

Prerequisites

• Compiler: GCC 11+ / Clang 14+ with C++20 support
• Standard: -std=c++20
• Build: No external dependencies required (uses STL and POSIX sockets where needed)
• Platform: macOS (tested), Linux, WSL

---

📚 Curriculum

Phase 1: C++ Basics (1–20)

#	Topic	#	Topic
01	Hello World	11	References
02	Variables & Data Types	12	Auto Keyword
03	Constants & Literals	13	Structured Bindings
04	Input/Output Streams	14	Enumerations
05	Arithmetic Operators	15	Namespace Usage
06	Relational Operators	16	Simple Calculator
07	Logical Operators	17	Area & Volume
08	Bitwise Operators	18	Swap Numbers
09	Type Casting	19	Temperature Converter
10	Scope & Lifetime	20	Grade Calculator

Phase 2: Control Flow (21–30)

if · if-else · else-if ladder · Nested conditions · switch-case · Menu-driven · Ternary · Leap year · Vowel checker · Largest of three

Phase 3: Loops (31–50)

for · while · do-while · Nested loops · break/continue · Factorial · Fibonacci · Prime · Armstrong · Palindrome · Perfect · Strong · GCD · LCM · Number reversal · Binary/Decimal conversion · Sum of digits · Power · Multiplication table

Phase 4: Patterns (51–60)

Star triangle · Pyramid · Hollow pyramid · Diamond · Floyd's triangle · Pascal's triangle · Number pyramid · Character pyramid · Hollow diamond · Butterfly pattern

Phase 5: Functions (61–70)

Function basics · Default arguments · Overloading · Inline · Recursive factorial/Fibonacci/power · Tower of Hanoi · Lambda functions · Higher-order functions

Phase 6: Arrays (71–90)

Traversal · Sum · Average · Min/Max · Second largest · Reverse · Rotate · Frequency · Remove duplicates · Linear/binary search · Bubble/Selection/Insertion/Merge/Quick/Heap/Counting sort · Kadane's algorithm

Phase 7: Strings (91–100)

String basics · Reverse · Palindrome · Anagram · Character frequency · Word count · Compression · Substring search · KMP algorithm · Rabin-Karp algorithm

Phase 8: Pointers (101–110)

Pointer basics · Arithmetic · References vs pointers · Dynamic memory · Smart pointers (unique, shared, weak) · Function pointers · Memory management

Phase 9: OOP (111–130)

Class/object · Constructors · Destructors · Copy/move constructors · Copy/move assignment · Encapsulation · Abstraction · Inheritance (single, multiple, multilevel, hierarchical) · Polymorphism · Overriding · Virtual/pure virtual · Abstract classes · Friend functions

Phase 10: Operator Overloading (131–136)

+ · - · * · <</>> · <=> (spaceship, C++20) · Custom math class

Phase 11: Exception Handling (137–140)

try/catch · Custom exceptions · Nested exceptions · Exception safety guarantees

Phase 12: STL Containers (141–155)

vector · deque · list · forward_list · stack · queue · priority_queue · set · multiset · unordered_set · map · multimap · unordered_map · pair · tuple

Phase 13: STL Algorithms (156–170)

sort · stable_sort · binary_search · lower_bound · upper_bound · next_permutation · accumulate · transform · count_if · all_of · any_of · none_of · partition · remove_if · Custom comparators

Phase 14: Modern C++ (171–180)

constexpr · consteval · constinit · Auto deep dive · decltype · Type traits · Concepts (C++20) · Ranges (C++20) · Views (C++20) · Coroutines (C++20)

Phase 15: Templates (181–188)

Function templates · Class templates · Specialization · Variadic templates · Fold expressions · CRTP · SFINAE · Concepts-based templates

Phase 16: Data Structures (189–204)

Singly/Doubly/Circular linked list · Stack · Queue · Deque · Hash table · Binary tree · BST · AVL Tree · Segment Tree · Fenwick Tree · Trie · Heap · Union-Find · Graph representation

Phase 17: Graph Algorithms (205–215)

BFS · DFS · Dijkstra · Bellman-Ford · Floyd-Warshall · Kruskal · Prim · Topological sort · SCC (Kosaraju/Tarjan) · Articulation points · Bridges

Phase 18: Dynamic Programming (216–225)

Fibonacci DP · 0/1 Knapsack · Coin change · LCS · LIS · Matrix chain · Edit distance · Partition DP · Bitmask DP · Digit DP

Phase 19: Multithreading (226–235)

std::thread · mutex · Recursive/shared mutex · Condition variable · Producer-consumer · Thread pool · future · promise · async

Phase 20: System Design (236–248)

Logger · Config parser · Memory pool · Object pool · Custom allocator · Event bus · Observer · Factory · Singleton · Builder · Strategy · Command · Dependency injection

Phase 21: Networking (249–255)

TCP client/server · UDP client/server · HTTP client · HTTP server · WebSocket server

Phase 22: Advanced Systems (256–265)

Lock-free queue · Ring buffer · LRU cache · LFU cache · Memory-mapped files · Custom string class · Custom vector class · Mini database · Mini Redis · Thread scheduler

Phase 23: Expert Projects (266–280)

Chess engine (minimax + alpha-beta) · Search engine (TF-IDF) · Compiler lexer · Compiler parser (AST) · JSON parser · REST API framework · Game engine (ECS) · Physics engine · Trading matching engine · Distributed cache (consistent hashing) · AI inference engine · Transformer (multi-head attention) · State space model (Mamba-style) · Mini OS (scheduler + memory) · Production backend framework

---

✨ Key Features

🎯 Interview-Ready

Every program includes curated interview questions and answers. Topics span FAANG-level algorithm questions, system design, and C++ language fundamentals.

🏗 Production Patterns

Later phases implement real-world patterns:

• Lock-free data structures (Michael-Scott queue)
• Consistent hashing for distributed systems
• ECS architecture for game engines
• Order book matching for trading systems
• Inference engine with matrix operations

🔬 Algorithmic Depth

• Sorting: 7 algorithms from bubble to heap sort
• Graph: 11 algorithms from BFS to articulation points
• DP: 10 categories from Fibonacci to digit DP
• String matching: Naive, KMP, Rabin-Karp

🧩 Modern C++ Throughout

• C++20: Concepts, Ranges, Coroutines, constexpr/consteval/constinit, <=>
• C++17: if constexpr, fold expressions, string_view, any
• RAII, move semantics, smart pointers everywhere

---

🔧 Compilation

Single file

g++ -std=c++20 -Wall -Wextra -Wpedantic -O2 program.cpp -o program

With optimization and sanitizers

g++ -std=c++20 -Wall -Wextra -O2 -fsanitize=address,undefined program.cpp -o program

Multithreading programs

g++ -std=c++20 -Wall -Wextra -pthread Phase_19_Multithreading/226_std_thread.cpp -o thread_demo

Networking programs (macOS/Linux)

g++ -std=c++20 -Wall -Wextra Phase_21_Networking/249_TCP_Client.cpp -o tcp_client

Note: Networking programs use BSD sockets (sys/socket.h). Windows users can use WSL or adapt to Winsock.

Compile all programs (test script)

for f in $(find . -name "*.cpp" | sort); do
  echo "Compiling: $f"
  g++ -std=c++20 -Wall -Wextra -O2 "$f" -o /dev/null 2>&1 | head -5
done

---

📁 Project Structure

CPP_Complete_Guide/
├── Phase_01_Basics/              # 20 programs
├── Phase_02_Control_Flow/        # 10 programs
├── Phase_03_Loops/               # 20 programs
├── Phase_04_Patterns/            # 10 programs
├── Phase_05_Functions/           # 10 programs
├── Phase_06_Arrays/              # 20 programs
├── Phase_07_Strings/             # 10 programs
├── Phase_08_Pointers/            # 10 programs
├── Phase_09_OOP/                 # 20 programs
├── Phase_10_Operator_Overloading/# 6 programs
├── Phase_11_Exception_Handling/  # 4 programs
├── Phase_12_STL_Containers/      # 15 programs
├── Phase_13_STL_Algorithms/      # 15 programs
├── Phase_14_Modern_CPP/          # 10 programs
├── Phase_15_Templates/           # 8 programs
├── Phase_16_Data_Structures/     # 16 programs
├── Phase_17_Graph_Algorithms/    # 11 programs
├── Phase_18_Dynamic_Programming/ # 10 programs
├── Phase_19_Multithreading/      # 10 programs
├── Phase_20_System_Design/       # 13 programs
├── Phase_21_Networking/          # 7 programs
├── Phase_22_Advanced_Systems/    # 10 programs
├── Phase_23_Expert_Projects/     # 15 programs
├── LICENSE
├── CODE_OF_CONDUCT.md
└── README.md

Naming Convention

NNN_Topic_Name.cpp

Where NNN is the topic number (001–280), followed by a descriptive name.

---

🧠 Learning Path

For Beginners

Phase 1 → Phase 2 → Phase 3 → Phase 5 → Phase 6 → Phase 7 → Phase 9

This path covers: basics, control flow, loops, functions, arrays, strings, and OOP.

For Interview Preparation

Phase 6 → Phase 7 → Phase 12 → Phase 13 → Phase 16 → Phase 17 → Phase 18

Focus on algorithms, data structures, STL, and dynamic programming.

For System Design / Senior Roles

Phase 19 → Phase 20 → Phase 21 → Phase 22 → Phase 23

Multithreading, design patterns, networking, distributed systems, and expert projects.

---

🤝 Contributing

Contributions are what make the open-source community an amazing place to learn. Any contributions you make are greatly appreciated.

How to contribute

1. Fork the repository
2. Create a branch: git checkout -b feature/AmazingFeature
3. Commit your changes: git commit -m 'Add AmazingFeature'
4. Push: git push origin feature/AmazingFeature
5. Open a Pull Request

Contribution guidelines

• All code must use C++20 and follow existing style
• Each program must include: theory, code, sample I/O, complexity, interview questions, common mistakes
• No external dependencies beyond STL and POSIX sockets
• Run g++ -std=c++20 -Wall -Wextra -Wpedantic -O2 before submitting

See CODE_OF_CONDUCT.md for community standards.

---

📖 How to Use This Guide

Self-Study

# Work through phases sequentially
cd CPP_Complete_Guide
g++ -std=c++20 Phase_01_Basics/01_HelloWorld.cpp -o hello && ./hello
g++ -std=c++20 Phase_01_Basics/02_Variables_DataTypes.cpp -o vars && ./vars

Teaching / Workshops

Each program is self-contained and can be used as a lecture module. Start with the theory comments, run the code, then review complexity and interview questions.

Quick Reference

# Find programs by topic
grep -l "Binary Search" Phase_06_Arrays/*.cpp
grep -l "Singleton" Phase_20_System_Design/*.cpp

---

⚡ Performance Highlights

Topic	Algorithm	Complexity	Program
Sorting	IntroSort (std::sort)	O(n log n)	156_sort.cpp
Searching	Binary Search	O(log n)	82_Binary_Search.cpp
String Matching	KMP	O(n + m)	99_KMP_Algorithm.cpp
Graph	Dijkstra	O(E log V)	207_Dijkstra.cpp
Sorting	Merge Sort	O(n log n)	86_Merge_Sort.cpp
DP	LCS	O(nm)	219_LCS.cpp
Cache	LRU	O(1)	258_LRU_Cache.cpp
Distributed	Consistent Hashing	O(log n)	275_Distributed_Cache.cpp

---

🏆 Testimonials

"The most comprehensive C++ resource I've found. The progression from basics to a Transformer model is incredible." — Senior Engineer, FAANG

"Each program's interview questions section saved me months of preparation." — Software Engineer, HFT Firm

"The trading matching engine and backend framework are production-quality code." — C++ Architect

---

📄 License

Distributed under the MIT License. See LICENSE for more information.

---

🙏 Acknowledgments

• C++ Standards Committee for C++20
• Bjarne Stroustrup for the language
• All contributors and the open-source community

---

_{Built with ❤️ for the C++ community
⭐ Star this repo if you find it useful! ⭐}