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In the world of 42, exams are not multiple-choice trivia. They are . Among them, Exam Rank 03 holds a special place — it is the gatekeeper between the intermediate and advanced circles of the curriculum.

The technical scope of Exam Rank 03 is deliberately narrow but brutally deep. Typically, the student is assigned one of two possible exercises: ft_printf or get_next_line . On the surface, these are projects the student supposedly completed weeks prior. However, the exam strips away the comfort of an IDE, the internet, and the safety net of a Makefile. Under a strict 4-hour time limit and a custom grading script (moulinette), the student must re-implement a simplified version of a standard library function from scratch.

What happens if the string is NULL ? What if the number is 0 ? What about INT_MIN ?

By following these tips and staying committed to your goals, you'll be well on your way to achieving Rank 03 and unlocking new opportunities in the world of software development. Good luck!

For every fork() , there is a wait() . For every open() , there is a close() . For every malloc() , there is a free() .

Prepare a mental library of helper functions. You will need: