How realloc Actually Works in C — Growth Strategies and the Pitfalls
Learn how realloc works under the hood, when it copies vs extends in place, how to grow dynamic arrays correctly, and the bugs that come from misusing it.
Read articleWriting Portable C Code — Platform Differences That Will Bite You
Learn the C portability traps that cause bugs when moving between Linux, macOS, and Windows. Integer sizes, endianness, type signedness, and compiler differences.
Read articlegetchar and putchar in C — Character I/O That Actually Works
Learn how getchar and putchar work in C, why getchar returns int not char, how to use them to copy input, count characters, and avoid scanf’s buffer problems.
Read articleint main() vs void main() in C — Why the Return Type Matters
Learn why int main() is correct in C and void main() is not. Understand return values, EXIT_SUCCESS, argc/argv, and the two valid signatures for main.
Read articleOperator Precedence in C — The Bugs That Look Correct
Learn the C operator precedence rules that cause the most real bugs. Bitwise operators, ternary, sizeof, and pointer arithmetic traps explained with examples.
Read articleSignal Handling in C — SIGINT, SIGTERM, and Graceful Shutdown
Learn how to handle signals in C programs. Write signal handlers for SIGINT and SIGTERM, understand async-signal safety, and implement clean shutdown.
Read articleBinary 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.
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