C Language Tutorial

When a C program runs, memory is divided into different sections called memory segments. जब कोई C program execute होता है तब memory विभिन्न sections में विभाजित होती है जिन्हें memory segments कहा जाता है। Main Memory Segments मुख्य मेमोरी सेग्मेंट्स 1. Text Segment Stores executable program code. यह executable program code store करता है। 2. Data Segment Stores initialized global and static variables. यह initialized global तथा static variables store करता है। 3. BSS Segment Stores uninitialized global and static variables. यह uninitialized global तथा static variables store करता है। 4. Heap Segment Used for dynamic memory allocation using malloc() and calloc(). यह malloc() तथा calloc() द्वारा dynamic memory allocation के लिए उपयोग होता है। 5. Stack Segment Stores local variables and function calls. यह local variables तथा function calls store करता है। Memory Layout Diagram ----------------- | Stack | ----------------- | Heap | ----------------- | BSS Segment | ---------...

Linux is one of the most popular operating systems for C programming and system-level development. Linux C programming तथा system-level development के लिए सबसे लोकप्रिय operating systems में से एक है। Most compilers like GCC are pre-installed or easily available in Linux. Linux में GCC जैसे compilers आसानी से उपलब्ध होते हैं। Important Linux Commands महत्वपूर्ण लिनक्स कमांड्स Compile Program gcc program.c -o program Run Program ./program List Files ls Clear Terminal clear Advantages of Linux for C Programming लिनक्स के लाभ Fast development environment Better terminal support Powerful debugging tools Open-source platform Linux provides a stable, secure, and powerful environment for C programming and software development. Linux C programming तथा software development के लिए stable, secure तथा powerful environment प्रदान करता है।

Linking is the process of combining object files and libraries to create an executable program. Linking वह प्रक्रिया है जिसमें object files तथा libraries को जोड़कर executable program बनाया जाता है। Static Linking स्टेटिक लिंकिंग In static linking, library code is copied directly into the executable file. स्टेटिक लिंकिंग में library code executable file में सीधे copy हो जाता है। Advantages: Faster execution No external dependency Disadvantages: Large executable size Dynamic Linking डायनामिक लिंकिंग  In dynamic linking, external shared libraries are loaded during runtime. Dynamic linking में external shared libraries runtime के दौरान load होती हैं। Advantages: Smaller executable size Easy library updates Disadvantages: Dependency on external libraries Comparison तुलना Static Linking Dynamic Linking Large executable       Small executable Faster      Slightly slower No dependency     Requires shared libraries Static linking improves portability,...

An Object File is an intermediate file generated after compilation of a C program. It contains machine-level code but is not directly executable. एक ऑब्जेक्ट फाइल एक intermediate file होती है जो C program के compilation के बाद बनती है। इसमें machine-level code होता है लेकिन यह सीधे execute नहीं होती। Object files usually have extensions: ऑब्जेक्ट फाइल्स की सामान्य extensions होती हैं: .o in Linux .obj in Windows Compilation Process Source Code → Compiler → Object File → Linker → Executable File GCC Command to Generate Object File ऑब्जेक्ट फाइल बनाने की GCC Command gcc -c program.c This command creates: program.o Advantages लाभ Faster compilation Modular programming Reusable code Object files help convert source code into executable programs efficiently using the linking process. ऑब्जेक्ट फाइल linking process की सहायता से source code को executable program में बदलने में सहायता करती हैं।

Visual Studio Code (VS Code) is a modern and lightweight code editor used for C programming. It supports extensions, terminal access, debugging, and compiler integration. Visual Studio Code (VS Code) एक modern और lightweight code editor है जिसका उपयोग C programming के लिए किया जाता है। यह extensions, terminal, debugging तथा compiler integration को support करता है। Step 1: Download VS Code Step 1: VS Code डाउनलोड करें Official Download Link: Download VS Code Step 2: Install MinGW Compiler Step 2: MinGW Compiler Install करें Official Download Link: Download MinGW-w64 After installation: Copy MinGW bin folder path Add it to Environment Variables → PATH Installation के बाद: MinGW bin folder path copy करें उसे Environment Variables → PATH में जोड़ें Step 3: Install C/C++ Extension Step 3: C/C++ Extension Install करें Open VS Code → Extensions → Search: C/C++ by Microsoft Install the extension. Step 4: Verify GCC Installation Step 4: GCC Installation Check करें Open terminal and type: gcc --...

GCC, Clang, and MinGW are popular compiler environments used to compile and execute C programs. These tools convert C source code into machine language so that the computer can run the program. GCC, Clang तथा MinGW लोकप्रिय compiler environments हैं जिनका उपयोग C programs को compile एवं execute करने के लिए किया जाता है। ये tools C source code को machine language में convert करते हैं ताकि computer program को run कर सके। GCC Compiler GCC stands for GNU Compiler Collection. It is one of the most widely used open-source compilers for C programming. GCC का पूर्ण रूप GNU Compiler Collection है। यह C programming के लिए सबसे अधिक उपयोग होने वाले open-source compilers में से एक है। Features: Open Source Cross-platform Fast and Powerful Supports multiple languages Download: GCC Official Website Clang Compiler Clang is a modern compiler based on LLVM architecture. It is famous for fast compilation and better error messages. Clang LLVM architecture पर आधारित आधुनिक compiler है। यह fast compilation...

ASCII stands for American Standard Code for Information Interchange. It is a standard character encoding system used in computers to represent characters, numbers, and symbols using numeric values. ASCII का पूर्ण रूप American Standard Code for Information Interchange है। यह एक standard character encoding system है जिसका उपयोग computers में characters, numbers तथा symbols को numeric values के रूप में दर्शाने के लिए किया जाता है। Every character in the keyboard has a unique ASCII value. For example: Keyboard के प्रत्येक character की एक unique ASCII value होती है। उदाहरण: A = 65, B = 66, ..., Z = 90 a = 97, b = 98, ..., z = 122 0 = 48, 1 =49, ..., 9=57 In C language, characters are internally stored as integer ASCII values, therefore we can easily print the ASCII value of a character using format specifiers. C language में characters internally integer ASCII values के रूप में store होते हैं, इसलिए हम format specifiers की सहायता से किसी character का ASCII value आसानी से print कर सकते हैं। ...

When we write a C program, the computer cannot directly understand our source code. The program must go through a series of steps before it becomes an executable file. This entire procedure is called the Compilation Process . Most modern C programs are compiled using compilers like GCC and Clang. Understanding this process is essential for advanced programming, debugging, linking multiple files, and system-level development. जब हम C प्रोग्राम लिखते हैं, तो कंप्यूटर सीधे हमारे source code को नहीं समझता। उसे executable फ़ाइल में बदलने के लिए कई चरणों से गुजरना पड़ता है। इस पूरी प्रक्रिया को Compilation Process कहा जाता है। अधिकतर C प्रोग्राम को compile करने के लिए GCC और Clang जैसे compilers का उपयोग किया जाता है। इस प्रक्रिया को समझना advanced programming और debugging के लिए बहुत आवश्यक है। Overview of Compilation Stages Source Code (.c) ↓ Preprocessor ↓ Compiler ↓ Assembler ↓ Object File (.o) ↓ Linker ↓ Executable File 1️⃣ Preprocessing Stage The pr...

 It includes: Memory Alignment Atomic Operations Race Conditions Cache Optimization CERT C Standards Static Analysis Tools ABI Reverse Engineering Sanitizers Embedded Firmware High Performance APIs Previous Unit-> Unit 10: System-Level and Modern C Programming Back To -> Main Syllabus

The highest level of C mastery. Topics include: POSIX Threads Synchronization & Mutex IPC Socket Programming Embedded C Real-Time Systems Kernel Programming C in Cybersecurity SIMD Optimization C11, C17, C23 👉 Read Detailed Unit 10 Notes Here Previous Unit-> Unit 9: Advanced C Programming Concepts Next Unit ->  Unit 11: Modern High-Level 2026 Topics Back To -> Main Syllabus

This unit separates beginner from professional developer. Topics include: Preprocessor Macros Conditional Compilation Command Line Arguments Multi-file Projects Static & Shared Libraries Debugging with GDB Valgrind Secure Coding Practices Buffer Overflow Prevention Undefined Behavior 👉 Read Detailed Unit 9 Notes Here Previous Unit -> Unit 8: File Handling and Persistent Storage Next Unit ->  Unit 10: System-Level and Modern C Back To -> Main Syllabus

Real-world data processing begins here. Topics include: File Streams Text vs Binary Files CRUD Operations Random File Access File Encryption CSV Processing Logging Systems 👉 Read Detailed Unit 8 Notes Here Previous Unit -> Unit 7: Structures and Advanced Data Structures Next Unit ->  Unit 9: Advanced C Programming Concepts Back To -> Main Syllabus

From memory design to real structures. Topics include: Structures and Unions Bit-fields Linked Lists Stack and Queue Circular & Doubly Linked List Trees and BST Hash Tables 👉 Read Detailed Unit 7 Notes Here Previous Unit -> Unit 6: Pointers and Memory Management Next Unit ->  Unit 8: File Handling and Persistent Storage Back To -> Main Syllabus

The most powerful and dangerous feature of C. Topics include: Pointer Arithmetic Double and Triple Pointers Void Pointers Function Pointers Dynamic Memory Allocation malloc(), calloc(), realloc() Memory Leaks Smart Memory Handling 👉 Read Detailed Unit 6 Notes Here Previous Unit -> Unit 5: Arrays, Strings and Algorithms Next Unit ->  Unit 7: Structures and Advanced Data Structures Back To -> Main Syllabus

This unit connects C to algorithm design. Topics include: 1D and Multi-dimensional Arrays Matrix Operations String Implementation Searching Algorithms Sorting Algorithms Merge Sort Quick Sort Algorithm Optimization Dynamic Arrays 👉 Read Detailed Unit 5 Notes Here Previous Unit -> Unit 4: Functions and Modular Programming Next Unit->  Unit 6: Pointers and Memory Management Back To -> Main Syllabus

Professional software architecture begins here. Topics include: Function Prototype Scope and Lifetime Recursion Tail Recursion Inline Functions Header Files Call by Value vs Reference Variable Arguments Stack Frames Function Pointers Callback Mechanism 👉 Read Detailed Unit 4 Notes Here Previous Unit-> Unit 3: Control Statements and Logic Building Next Unit ->  Unit 5: Arrays, Strings and Algorithms Back To -> Main Syllabus

This unit focuses on algorithmic thinking and logic mastery. Topics include: if, switch, ternary for, while, do-while Loop Optimization break, continue, goto Decision Trees Pattern Programming Time Complexity Basics 👉 Read Detailed Unit 3 Notes Here Previous Unit-> Unit 2: Tokens, Data Types and Operators Next Topic ->  Unit 4: Functions and Modular Programming Back To -> Main Syllabus

This unit builds strong syntax-level clarity and data handling precision. Topics include: Keywords and Identifiers Constants and Variables Primitive and Derived Data Types Type Qualifiers typedef and Enumeration Operator Types Bitwise Operations Type Casting Integer Overflow Floating Point Precision 👉 Read Detailed Unit 2 Notes Here Previous Unit->  Unit 1: Computer Architecture and C Environment Next Unit->  Unit 3: Control Statements and Logic Building Back To -> Main Syllabus

This unit builds the foundation of how C interacts with hardware and operating systems. Topics Covered: Classification of Programming Languages Structured / Modular Programming Control Structures (Sequential, Selection, Iterative) Top-Down & Bottom-Up Approach SDLC and Problem Solving  , Algorithm , Flowchart History & Evolution of C Structure of C Program  , Basic and Important C Programs with Output Compilation Process GCC, Clang, MinGW VS Code Setup Object Files Static vs Dynamic Linking Linux Environment for C Memory Layout (Stack, Heap, BSS, Data, Text Segment) Next Unit-> Unit 2: Tokens, Data Types and Operators Back To -> Main Syllabus

Simple Interest is one of the most common mathematical calculations used in banking, finance, education, and accounting systems. In C language, we can easily calculate Simple Interest using arithmetic operators and basic input-output functions. Simple Interest बैंकिंग, finance, education तथा accounting systems में उपयोग होने वाली सबसे सामान्य mathematical calculations में से एक है। C language में arithmetic operators तथा basic input-output functions की सहायता से Simple Interest आसानी से निकाला जा सकता है। Formula of Simple Interest साधारण ब्याज का सूत्र The formula used to calculate Simple Interest is: Simple Interest निकालने के लिए निम्न formula का उपयोग किया जाता है: SI=P*R*T/100 Where: P = Principal Amount मूलधन R = Rate of Interest ब्याज दर T = Time समय SI = Simple Interest साधारण ब्याज Algorithm एल्गोरिथ्म Start the program Declare variables p, r, t, and si Input principal, rate, and time Calculate simple interest using formula Display the result Stop the program C Progra...

Sequential structure programs are the simplest programs in C language where statements are executed one after another in sequence. These programs help beginners understand variables, operators, input-output functions, formulas, and basic program logic. Sequential structure programs C language के सबसे सरल programs होते हैं जिनमें statements क्रमवार execute होते हैं। ये programs विद्यार्थियों को variables, operators, input-output functions, formulas तथा basic programming logic समझने में सहायता करते हैं। 1. C Program to Calculate Simple Interest 1. Simple Interest निकालने का C Program #include<stdio.h> int main() { float p,r,t,si; printf("Enter Principal, Rate and Time:\n"); scanf("%f%f%f",&p,&r,&t); si = p*r*t/100; printf("Simple Interest = %.2f",si); return 0; } Output: Enter Principal, Rate and Time: 1000 5 2 Simple Interest = 100.00 2. C Program to Find ASCII Value of a Character 2. Character का ASCII Value ज्ञात ...

Every programming language follows a specific structure or format for writing programs. In C language, a program is divided into different sections, where each section performs a particular task. Understanding the structure of a C program is very important because it helps beginners learn how C programs are organized, compiled, and executed. प्रत्येक प्रोग्रामिंग लैंग्वेज में प्रोग्राम लिखने का एक निश्चित प्रारूप या संरचना होती है। C language में भी program को विभिन्न sections में विभाजित किया जाता है, जहाँ प्रत्येक section एक विशेष कार्य करता है। C program की संरचना को समझना अत्यंत महत्वपूर्ण है क्योंकि इससे विद्यार्थियों को यह समझने में सहायता मिलती है कि C programs कैसे organize, compile तथा execute होते हैं। Basic Structure of a C Program सी प्रोग्राम का मूल स्ट्रक्चर A standard C program generally contains the following sections: एक सामान्य C program निम्न sections से मिलकर बना होता है: Include Section Global Constants and Macro Section Function Declaration Section Main Functi...