How 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.
Read articleThe volatile Keyword in C — When the Compiler Is Wrong About Memory
Learn when to use volatile in C for memory-mapped hardware, signal handlers, and setjmp. Understand what volatile does and does not guarantee.
Read articleunion in C — What It Is, How It Works, and When to Use It
Learn how C unions store multiple types in the same memory. Understand type punning, tagged unions, and the safe way to read from a union you wrote to differently.
Read articleStruct Padding and Memory Alignment in C — Why sizeof Lies
Learn why structs in C have unexpected sizes due to padding. Understand alignment requirements, how to minimize padding, and when to use __attribute__((packed)).
Read articleMakefile Basics for C Projects — Stop Recompiling Everything
Learn how to write a Makefile for a C project. Understand rules, dependencies, variables, and automatic variables so you only recompile what changed.
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