Pointers are the single most-asked topic in C interviews — and the topic where most candidates lose the job. This page collects 25 real C pointer interview questions with clear answers and tested, compilable code for every one: pointer basics, const placement, pointer arithmetic, arrays vs pointers, function pointers, dynamic memory, and the predict-the-output traps …

Linux is C’s home turf — the kernel, the shell, and most of the tools you’re using were written in it — and compiling C there is a two-command job once you know the pattern. This guide takes you from a .c file to a running program on any Linux system (a desktop, a cloud …

A Mac is a superb machine for learning C — it’s Unix underneath, the compiler is free, and the whole setup is genuinely one command. But macOS has its own toolchain with a few surprises that trip up everyone who learned C on Linux or Windows: gcc isn’t really GCC, there’s no GDB, and Valgrind …

Every C programmer eventually asks it: should I use GCC or Clang? The honest answer is that for learning and for most projects it matters far less than people think — they accept the same flags, compile the same standard C, and produce programs that behave identically. But they are genuinely different tools with different …

Make is the classic way to build C — but write Makefiles long enough and you meet its sharp edges: header dependencies you must list by hand, tab-vs-space landmines, and a file that only works on Unix. CMake is the industry’s answer, and it’s what you’ll meet in almost every serious C/C++ codebase today. This …

The scariest C bugs are the ones that don’t crash. A program can leak memory on every iteration, write past the end of a buffer, and still print the right answer and exit 0 — until it runs long enough to matter. Valgrind catches exactly this class of bug: it runs your program under a …