C Programming Tutorial¶

C Programming PathRoadmap Overview

Recommended order: C roadmap -> Foundations -> Control Flow -> Functions -> Arrays -> Pointers -> Memory -> Structures -> Files

Best for: Absolute beginners, std-10/12 board students, engineering first-year

Prerequisites: None

C is the language that built modern computing. The Linux kernel, Python interpreter, MySQL database — all written in C. Learning it gives you a level of understanding that no other language can match.

This course takes you from your first printf to dynamic memory, file I/O, and pointer arithmetic — at a pace built for Indian board students and engineering first-years.

Who this is for

GSEB / CBSE Std 10 & 12 students with C in their syllabus
Engineering first-year students (BCA, B.Tech) learning programming fundamentals
Anyone who wants to truly understand how a computer works under the hood

Where C is used¶

Domain	Examples
Operating Systems	Linux kernel, Windows kernel, macOS core
Embedded Systems	Arduino, IoT devices, microcontrollers
Databases	MySQL, SQLite, PostgreSQL
Compilers & Interpreters	Python (CPython), PHP, Ruby — all built in C
Game Engines	Core engine layers of Unity, Unreal

Learning Path¶

Follow the modules in order. Each one builds on the previous.

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1. Introduction

What is C, History & Setup

Learn what C is, why it is still relevant in 2025, and set up your compiler (GCC on Linux/Mac, MinGW or Dev-C++ on Windows).

Begin the Course →

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2. Foundations

Variables, Data Types, Operators

Master variables, primitive data types (int, float, char), type casting, and all C operators including increment/decrement.

Learn the Basics →

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3. Control Flow

if-else, switch, Loops

Control program execution with if-else, switch, while, for, do-while, break, and continue.

Control Execution →

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4. Functions

Definition, Arguments, Recursion

Write reusable functions, understand call-by-value vs call-by-reference, scope rules, and master recursion with classic examples.

Write Functions →

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5. Arrays & Strings

1D/2D Arrays, char[], string.h

Store collections with 1D and 2D arrays, manipulate text with char arrays, and use string.h functions like strlen, strcpy, strcmp.

Work with Arrays →

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6. Pointers

Address, Dereferencing, Pointer Arithmetic

The most powerful (and feared) feature of C. Learn memory addresses, * and & operators, pointer arithmetic, and pointers with arrays and functions.

Understand Pointers →

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7. Memory Management

malloc, calloc, realloc, free

Allocate memory at runtime with malloc/calloc, resize with realloc, and avoid memory leaks with free. The key skill for systems programming.

Manage Memory →

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8. Structures & Unions

struct, union, typedef, enum

Group related data with struct, save memory with union, create readable names with typedef, and define constants with enum.

Group Your Data →

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9. Preprocessor & Macros

#include, #define, #ifdef

Understand what happens before compilation — #include headers, #define constants and macros, conditional compilation with #ifdef/#endif.

Use Preprocessors →

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10. File Handling

fopen, fprintf, fscanf, fclose

Read and write text and binary files using FILE*, fopen, fprintf, fscanf, and fclose. Essential for real-world C programs.

Handle Files →

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11. Practice Programs

Board Exam & Interview Ready

100+ C programs covering GSEB Std 10/12, CBSE practicals, engineering assignments, and common technical interview questions.

Start the Coding Lab →

Before you start¶

Recommended setup

Windows: Install Dev-C++ or MinGW + VS Code
Linux / Mac: GCC is pre-installed — just open a terminal and type gcc --version
Online (no install): Use onlinegdb.com/online_c_compiler to run code in your browser instantly

Your first C program

#include <stdio.h>

int main() {
    printf("Hello, VD Computer Tuition!\n");
    return 0;
}

Compile and run with: gcc hello.c -o hello && ./hello

Ready? Start with Introduction to C →