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Soras Academy Edition
The Complete C Programming Language Notes
Exhaustive reference manual synthesizing the 50-Hour C Mastercourse & Dr. Chuck's K&R Classic Series. From hardware architecture up to kernel internals and data structures.
1. Computer Architecture & How C Works Under The Hood
C operates as a high-level abstraction over the Von Neumann computer architecture (Control Unit, ALU, Registers, and RAM). Source code transforms through the GCC 4-Stage Pipeline:
Stage
Input File
GCC Flag
Output File
Action
1. Preprocessing
main.c
gcc -E
main.i
Expands #include, #define, strips comments.
2. Compilation
main.i
gcc -S
main.s
Translates C to Target CPU Assembly instructions.
3. Assembly
main.s
gcc -c
main.o
Converts Assembly to Machine Code (Object Binary).
4. Linking
main.o
gcc -o
main
Resolves libc symbols and produces executable ELF/Mach-O.
Module 02 • Language Standards
2. C Language Foundation & Standards
Created by Dennis Ritchie at Bell Labs (1972) to write UNIX. Governed by ANSI/ISO standards: C89/C90, C99 (inline declarations, VLAs), C11 (threads, atomics), C17 (bug fixes), and C23 (nullptr, constexpr).
Module 03 • Data Types & Binary
3. Data Types, Variables & Binary Representation
Negative signed integers are stored in hardware using Two's Complement (Invert all bits and add 1). For fixed-width cross-platform systems, use <stdint.h> (int8_t, int16_t, int32_t, int64_t, uint32_t, uint64_t).
Module 04 • I/O Deep Dive
4. Input & Output Operations (printf / scanf)
printf supports formatting flags (%08d, %.2f, %p). scanf leaves trailing newlines \n in stdin. Use safe fgets(buffer, sizeof(buffer), stdin); for production string input.
Module 05 • Bitwise Manipulation
5. Operators & Bitwise Manipulation Recipes
bit_recipes.c
// 1. Set bit n: num |= (1U << n);
// 2. Clear bit n: num &= ~(1U << n);
// 3. Toggle bit n:num ^= (1U << n);
// 4. Check bit n: (bool)((num >> n) & 1);
// 5. Power of 2: (n > 0) && ((n & (n - 1)) == 0);
Module 06 • Control Flow
6. Control Flow & Decision Making
if-else constructs evaluate boolean conditions. switch-case compiles into Jump Tables (O(1) branching) for consecutive integer constants. Always include break; to prevent accidental fall-through.
Module 07 • Loops & Iteration
7. Iteration & Looping Constructs
while evaluates condition at entry (0 to N iterations). do-while evaluates condition at exit (guaranteed 1 to N iterations). for loops provide compact initialization, condition, and increment expressions.
Module 08 • Functions & Storage
8. Functions, Storage Classes & Recursion
C is strictly pass-by-value. Pointers simulate pass-by-reference. Storage classes define scope and lifetime: auto (stack), register (CPU), static (data segment lifetime), and extern (global cross-file linkage).
Module 09 • Arrays & Matrices
9. Arrays & Multidimensional Matrices
Arrays allocate contiguous blocks in RAM. The array name decays into a pointer to its first element (arr[i] == *(arr + i)). 2D arrays flatten linearly via Row-Major Order: Linear Index = (row * COLS) + col.
Module 10 • Pointers Mastery
10. Pointers & Deep Memory Mastery
A pointer variable stores the memory address of another variable. Pointer arithmetic scales by sizeof(*ptr) bytes. Double pointers (int **p) allow mutating pointer targets across function boundaries.
Module 11 • Strings & Algorithms
11. Strings & Character Algorithms
C strings are null-terminated ('\0') character arrays. Array declarations (char s[] = "hi";) are mutable on the stack, while string literal pointers (char *s = "hi";) point to read-only .rodata memory pages.
Module 12 • Dynamic Heap Memory
12. Dynamic Memory Allocation (Heap)
malloc() allocates uninitialized raw bytes. calloc() allocates zero-initialized memory. realloc() resizes allocations. Always free(ptr) and set ptr = NULL to prevent dangling pointer bugs.
Module 13 • Structs & Word Alignment
13. Structures, Unions & Memory Alignment
Hardware CPUs access RAM in 4-byte or 8-byte word strides. Compilers insert struct padding bytes to ensure members align along natural addresses. Unions overlap all members at offset 0.
Module 14 • File Handling
14. File Handling & Stream I/O
Files are accessed via FILE* streams. Text mode performs newline translation, while binary mode ("rb"/"wb") streams exact raw bytes using fread() and fwrite(). Random access uses fseek() and ftell().
Module 15 • Preprocessor Metaprogramming
15. The C Preprocessor & Macros
Macros perform text substitution before compilation. Always wrap parameters in parentheses (#define SQ(x) ((x)*(x))). Features include stringification (#), token-pasting (##), and #pragma once.
Module 16 • Advanced DSA & Interview Q&A
16. Advanced C, Data Structures & Top 50 Interview Q&A
Includes production Makefiles, Singly Linked Lists, Stacks, Queues, Binary Search Trees, and solutions for the top 50 high-frequency C technical interview questions.