Binary File I/O in C — fread, fwrite, fseek, and ftell
Learn how to read and write binary files in C with fread, fwrite, fseek, and ftell. Covers struct serialization, file positions, and cross-platform pitfalls.
Read articleWriting a Hash Table in C from Scratch
Learn how to implement a hash table in C with separate chaining. Covers hash functions, collision handling, dynamic resizing, and deletion.
Read articleTwo’s Complement — Why -1 in Binary Looks Like 0xFFFFFFFF
Learn how two’s complement represents negative integers in C, why -1 is all ones in binary, how overflow works, and what this means for bit manipulation.
Read articleValgrind Basics — Finding Memory Leaks and Invalid Reads in C
Learn how to use Valgrind to find memory leaks, invalid reads, use-after-free bugs, and uninitialized memory in C programs. With real output examples.
Read articleHow qsort Works in C — Sorting Any Type with Function Pointers
Learn how to use qsort in C to sort integers, strings, structs, and custom types. Understand the comparator contract and common mistakes.
Read articleenum in C — Patterns, Sizes, and the Mistakes You’re Probably Making
Learn how C enums work, their size and underlying type, how to use them as flags, and the common pitfalls around assignment, comparison, and switch statements.
Read articleconst in C — Where to Put It and What It Actually Protects
Learn where to place const in C declarations, the difference between const pointer and pointer to const, and how const correctness prevents bugs at compile time.
Read articleRecursion in C — When It Overflows the Stack and How to Fix It
Learn when recursion causes stack overflow in C, how to calculate stack depth limits, tail recursion, and when iteration is a better choice.
Read articleHow to Measure Time in C — clock(), time(), and High-Resolution Timers
Learn how to measure elapsed time in C using clock(), time(), clock_gettime(), and how to benchmark your code correctly across different platforms.
Read articleargc and argv in C — Parsing Command Line Arguments Correctly
Learn how argc and argv work in C, how to parse flags and values, common pitfalls with string conversion, and how to validate arguments correctly.
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