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So, I am beginner in C, and I really want to do pset2's hacker edition. I've already finished intitials.c in the hacker edition, now I need to do crack.c. So, I've tried to understand the crypt man page, but I couldn't understand much (actually, almost nothing). So, my questions are: Is crack.c doable for a beginner? Why should I include #define _XOPEN_SOURCE and #include <unistd.h> in the code? How does the crypt function works? Thank you.

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Post the code, tell us which sections you understand and what you don't. Show that you've made an effort so that we can assist you.

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