Category: C Programming

Read program arguments via argc and argv.

Handle failures with return codes, errno, and perror.

Manage stack vs heap, lifetimes, and ownership clearly.

Include headers with #include or “local”.

Understand register as a historical optimization hint.

Read and write files with FILE* and stdio file APIs.

Open streams with fopen modes and close with fclose.

Use fgets/fputs, fprintf/fscanf, and fread/fwrite as appropriate.

Process line-oriented text data with formatted I/O.

Read/write raw bytes/structs with fread/fwrite in binary mode.