C Programming with Examples

C Programming with Examples is a complete C language course in one app: 45 lessons where every concept is taught through worked examples, then 82 C programs to practise with.
Read a lesson, run its examples, check yourself with practice questions, then study full programs on the same topic. It all works offline.

Most C apps give you either theory or a list of programs. Here you get both, linked together. Each lesson explains one idea in plain words and shows it in short, complete C programs with their real output, so you see what the code does instead of just reading about it. More than 150 example programs sit inside the lessons alone, plus 26 diagrams of what happens in memory.

Part 1: learn the C language with examples (45 lessons in 11 sections)
• Getting started: what is C, setting up a compiler, your first program, how compilation works, comments
• Basics: keywords and identifiers, variables, constants, data types and sizes, operators, precedence and conversions, output with printf, input with scanf and fgets
• Control flow: if and else, the switch statement, the for loop, while and do-while loops, break and continue
• Functions: arguments and return values, scope and lifetime, recursion
• Arrays and strings: multi-dimensional arrays, string functions and safety
• Pointers and memory: pointers and arrays, pointers and functions, dynamic memory with malloc and free
• Your own types: structures, unions, enumerations, typedef
• Files: opening, writing and reading files, binary files
• Larger programs: the preprocessor, macros and their pitfalls, multi-file programs
• Errors and debugging: common mistakes with the real compiler messages, undefined behaviour, debugging tips
• Reference: a C quick-reference cheat sheet and what is new in C23

Part 2: 82 C programming examples to practise with (11 sections)
• Basics and conditions: swap two numbers, even or odd, leap year, largest of three numbers, quadratic equation
• Loops and numbers: factorial, Fibonacci series, prime numbers and the Sieve of Eratosthenes, Armstrong numbers, GCD and LCM, nCr and nPr
• Pattern programs: star pyramid, diamond, Floyd's triangle, Pascal's triangle
• Number systems: decimal, binary, octal and hexadecimal conversions, bitwise operators
• Arrays and matrices: linear and binary search, bubble, selection and insertion sort, matrix multiplication, transpose, determinant
• Strings: reverse, palindrome, vowels and consonants, anagram check, string to integer
• Pointers, structures and files: dynamic arrays, function pointers, Tower of Hanoi, student records, copy a file
• Simple projects: calculator, bank account menu, number guessing game, tic-tac-toe

Practise as you learn
• 130 practice questions with answers: try first, then tap to see the answer
• "Program with a mistake" examples show buggy C code and what goes wrong, so you learn to spot and fix errors
• Every program in Part 2 has a sample run and a "how it works" explanation
• Links between related lessons and programs

Features
• Modern standard C (C17), with notes on C23
• Search across all lessons and programs
• Works offline, no account needed
• Dark mode; code blocks scroll sideways so C code stays readable on a phone
• Available in 8 languages: English, Español, Português, Français, Deutsch, العربية, हिन्दी and Bahasa Indonesia (explanations are translated; the C code stays the same)

Who it is for
• Beginners who want to learn the C language from zero with examples, not just theory
• Students taking a C programming course who need practice questions and example programs for exams and lab work
• Anyone who knows some C and wants to fill gaps in pointers, memory, strings or files

C Programming with Examples is an independent study aid based on the ISO C standard and the GCC and Clang documentation; it is not affiliated with any compiler vendor, university or standards body.