Read getopt code to learn C easily and get familiar with ARGV and ARGC. 

github.com/mrdoob/three.js/bl...
replit.com/@xargs/DroopyNegat...
Even if you learn the theory of pointers and arrays, the field staff will feel that there is a gap between them and practical coding. How does a beginner actually become an intermediate and get paid well?　As a hint, we will read some simple open source code and look at how pointers are actually used and how they differ from arrays.

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