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1. Introduction to • C PROGRAMMING https://techcaddcomputerinstitute.com +91 9888122255

2. WHAT IS A C PROGRAMMING? • What is C? • History and creators (Dennis Ritchie, 1972) • Importance of C in modern programming • Applications: OS development, embedded systems, games

3. HISTORY OF PROGRAMMING C programming was developed in the early 1970s by Dennis Ritchie at Bell Labs as an evolution of the B programming language. It was initially designed for system programming on the UNIX operating system. C's simplicity, efficiency, and portability made it popular for software development across various platforms. In 1978, Brian Kernighan and Dennis Ritchie published "The C Programming Language," which became the definitive guide for learning C. Over the years, C has influenced many other languages, including C++, C#, and Java. It remains a foundational language for system-level programming, embedded systems, and software development.

4. TYPES OF C PROGRAMMING Embedded Programming: Procedural Programming: • System Programming: • C is widely used for system-level programming, such as operating system development, device drivers, and embedded systems. Its low-level capabilities give direct control over hardware. • C is a popular choice for programming embedded systems due to its efficiency and ability to interact directly with hardware. It is used in microcontroller programming, IoT devices, and real-time systems. • C is primarily known for its procedural programming paradigm, where programs are structured as sequences of instructions or functions. It focuses on logic and functions that operate on data. Application Programming: • Network Programming: Real-Time Programming: • C is used in real-time systems where precise timing and resource management are critical, such as in aerospace or automotive control systems. • C can also be used for developing software applications, especially when performance is a critical factor, such as in games, graphics, or scientific computations. • C is also used in the development of network protocols, sockets, and client-server applications, often for performance-critical networking tasks.

5. WHY CHOOSE C ? • Portability: Code written in C can run on different systems with minimal changes. • Efficiency: Provides low-level access to memory and hardware, making it faster. • Wide Adoption: Used in operating systems (UNIX), embedded systems, and compilers. • Foundation for Other Languages: Influenced languages like C++, Java, and C#.

6. ARRAY VS STRING • An array in C is a collection of variables that are of the same data type, stored in contiguous memory locations. The size of an array is defined at the time of declaration, and it can hold multiple values of the same type, such as integers, floats, or characters. • Key Points to Remember About Arrays in C: • Fixed Size: The size of the array must be specified at the time of its creation and cannot be changed during runtime. • Contiguous Memory: Elements of an array are stored in adjacent memory locations. • Zero-Based Indexing: Array indices start at 0, so the first element is accessed via array[0], the second element via array[1], and so on. • A string in C is a sequence of characters stored in a contiguous block of memory. In C, strings are represented as arrays of characters, and they are always terminated with a special character called the null character ('\0'). • Key Points About Strings in C: • Null-Termination: Every string in C ends with the null character '\0', which signifies the end of the string. This is how C functions and libraries know where the string ends. • Character Array: A string is essentially an array of char type, and each character is stored in consecutive memory locations. • Fixed Length: The length of a string in C is fixed once declared, but functions like strlen() can be used to determine the length at runtime.

7. POINTERS IN C PROGRAMMING • What is a Pointer?: A pointer stores the address of another variable. • Pointer Syntax: • int *ptr; declares a pointer to an integer. • ptr = &var; stores the address of var in ptr. • Pointer Arithmetic: Allows navigation through arrays. • Dereferencing: *ptr to access the value at the pointer address.

8. 01 • 02 Compilation Preprocessing • The compiler checks for syntax errors and translates the C code into machine code (object code). • The #include <stdio.h> is replaced with the contents of stdio.h, making the printf function available. • 03 • 04 Linking Execution • The program is loaded into memory, and the CPU executes the code. It calls printf, which displays "Hello, World!" on the screen. • The linker connects the object file with the standard C library to resolve external references (like printf).

9. LIFE OF A C PROGRAMMING • The life of a C program is an interesting journey, from when you first write the code all the way through to the program's execution and eventual termination. It’s a multi-step process that involves multiple stages, tools, and systems working together to transform your code into a running application. Here's a breakdown of the "life cycle" of a C program:

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