🧠 Learn C Programming

C is a high-performance, system-level programming language that powers operating systems, compilers, embedded devices, game engines, and databases. Learning C gives you an intimate understanding of computer memory, hardware, pointers, and systems programming.

🟢 Beginner to Advanced: Start with compiler setup, master primitive types, control flow, functions, dynamic memory allocation (malloc/free), advanced pointers, file I/O, structs, unions, macros, and multi-file project compilation.

📖 What You Will Learn

  • Setting up GCC/Clang compilers and writing ISO C11 applications
  • Primitive data types, format specifiers, and stream I/O (printf, scanf, fgets)
  • Control structures, loops, and function modularization
  • Multidimensional arrays, string manipulation, and standard libraries (<string.h>)
  • Pointers, memory addresses, pointer arithmetic, double pointers, function pointers, and void*
  • Dynamic memory allocation on the Heap (malloc, calloc, realloc, free)
  • User-defined data types (struct, union, enum, typedef, bit fields)
  • Persistent file I/O operations (fopen, fprintf, fread, fwrite, fseek)
  • C Preprocessor directives (#define, #ifdef, #ifndef) and safe macros
  • Storage classes (static, extern, auto, register) and CLI argument parsing (argc/argv)
  • Multi-file C project structure, header files (.h), and Makefiles
  • Error handling with errno, perror(), and defensive programming

📚 Lessons

# Topic Level Link
01 Set Up C Environment 🟢 Beginner Open lesson
02 Introduction to C 🟢 Beginner Open lesson
03 Variables & Data Types 🟢 Beginner Open lesson
04 Input & Output (printf, scanf, fgets) 🟢 Beginner Open lesson
05 Operators in C 🟢 Beginner Open lesson
06 Conditionals (if, else, switch) 🟢 Beginner Open lesson
07 Loops (for, while, do-while) 🟢 Beginner Open lesson
08 Functions & Scope 🟢 Beginner Open lesson
09 Arrays & Multidimensional Arrays 🟡 Intermediate Open lesson
10 Pointers Basics & Memory Addresses 🟡 Intermediate Open lesson
11 Advanced Pointers & Pointer Arithmetic 🔴 Advanced Open lesson
12 Strings in C (<string.h>) 🟡 Intermediate Open lesson
13 Dynamic Memory Allocation (malloc, free) 🔴 Advanced Open lesson
14 Structures (struct) & typedef 🟡 Intermediate Open lesson
15 Unions & Bit Fields 🔴 Advanced Open lesson
16 Enumerations (enum) 🟡 Intermediate Open lesson
17 File Handling (fopen, fread, fwrite) 🔴 Advanced Open lesson
18 C Preprocessor & Macros (#define, #ifdef) 🟡 Intermediate Open lesson
19 Storage Classes & Qualifiers (static, extern) 🔴 Advanced Open lesson
20 Command Line Arguments (argc, argv) 🟡 Intermediate Open lesson
21 Multi-file Projects & Header Files (.h) 🔴 Advanced Open lesson
22 Error Handling & Debugging (errno, perror) 🔴 Advanced Open lesson
23 Comprehensive C Mini Projects 🔴 Advanced Open lesson

🎯 Suggested Learning Flow

01–08 C Fundamentals → 09–12 Arrays, Strings & Basic Pointers → 13 Dynamic Memory Allocation → 14–16 Data Structures & Custom Types → 17 File I/O → 18–22 Advanced Systems Topics → 23 C Mini Projects

🧪 Practice Routine

  1. Read the lesson explanation and study the C code example.
  2. Compile code using gcc -Wall -Wextra -std=c11 filename.c -o program.
  3. Run executables in terminal and inspect output.
  4. Experiment with pointer addresses, memory allocations, and edge cases.
  5. Solve the “Try It Yourself” and “Mini Challenge” tasks.

✅ Progress Checklist

  • I can write, compile, and debug C applications with gcc -Wall -Wextra -std=c11.
  • I understand pointer arithmetic, dereferencing, and memory layouts.
  • I can dynamically allocate and free heap memory without memory leaks.
  • I can read/write binary and text files using C standard file streams.
  • I understand storage classes (static, extern) and scope rules.
  • I can organize complex C codebases into header files (.h) and separate source files (.c).

🧭 Navigation

← Repository Home Start with Lesson 01 →