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Learn C by Seeing, Doing, and Understanding

Reading textbooks isn't enough. An in-browser simulator, step-by-step tracing, and memory diagrams
make C's inner workings visible. (Designed for learning — verify with a real compiler for production work.)

Pick your learning track🐣 Beginner 1 week / ⚡ Experienced 3 days / 🎓 Exam prep 4 days
Or start from Lesson 1 at your own pace →
60
Total Pages
110+
Interactive Explanations
120+
Practice Problems
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Popular Content

Start here — most requested topics

🔗 Pointers Tutorial
The biggest wall in C. Master pointers with memory visualization and swap examples.
📋 Cheat Sheet
printf formats, operators, data types, standard library — all in one page.
✏️ 39 Practice Problems
From if/else to sorting algorithms. Hints and solutions included.
🧠 40 Memory Trace Problems
Read code, trace variable values. The best exam prep.
🎮 Game Projects
Number guessing, Tic-tac-toe, Blackjack, Minesweeper, and more.
📚 Best C Books
Top 10 C programming books for beginners to advanced.

Complete Curriculum (43 Lessons + Special Content)

Step-by-step learning path

PREPPreparation — Setting up your environment
00
Setup Guide
STEP 1Introduction — First steps in C
01
What is Programming?
 02
Hello World
 03
Variables
 04
printf / scanf
 05
Quiz: Variables & printf
 06
Quiz: scanf
STEP 2Operators — Understanding calculations
07
Arithmetic Operators
 08
Quiz: Arithmetic
 09
Assignment & Increment
 10
Comparison & Logical
STEP 3Conditionals — Making decisions
11
if Statement
 12
Quiz: if
 13
else if & switch
STEP 4Loops, Arrays & Strings
14
for / while / do-while
 15
Quiz: Loops
 16
Debugging
 17
math.h Functions
 18
Random Numbers
 19
Arrays
 20
Quiz: Arrays
 21
Strings
 22
Quiz: Strings
STEP 5Functions — Organize and reuse code
23
Functions (Basic)
 24
Functions (Advanced)
 25
Prototype & #define Macro
 26
Global Variables
 27
Arrays as Arguments
 28
Quiz: Functions
 29
Recursion
 30
Command Line Arguments
STEP 6Advanced — The heart of C
31
Pointers
 32
Quiz: Pointers
 33
Structs
 34
Quiz: Structs
 35
Unions
 36
File I/O
 37
Dynamic Memory (malloc/free)
 38
Quiz: Dynamic Memory
 39
Bitwise Operations
STEP 7Algorithms — Master computational techniques
40
Data Structures
 41
Sorting Algorithms
ERRError Dictionary — Look up by error message
42
Compile Errors Dictionary
 43
Runtime Errors & Segfault
PRACPractice — Hands-on exercises
★
Practice Problems (39)
 ★
Fill-in Exam Prep (30 Qs)
 ★
Memory Trace Problems (40)
 ★
Game Projects (10)
 ★
Pseudocode → C Practice
ADVAdvanced Topics — Real-world techniques
★
Numerical Computing
 ★
Multi-dim Arrays (deep dive)
 ★
Build Simulations
 ★
Image Processing
 ★
Booleans (truthy/falsy)
 ★
Simple TCP Client & Server
 ★
HTTP Client
 ★
SMTP Client
PROProfessional — Intermediate topics you'll meet on the job
★
Multi-file Projects & Makefile
 ★
Function Pointers & qsort
 ★
Safe String Handling
 ★
Hands-on gdb
 ★
Intermediate (const/enum/typedef/errno/varargs)
 ★
pthreads Intro
REFReference — Use as dictionary
★
Cheat Sheet
 ★
Recommended Books
 ★
FAQ
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