Declaration vs. Definition of a variable in C

Source code can be found here:
code-vault.net/lesson/6d7531s...
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[@189Blake]

Off-topic: Nice to see you back, you're the best C channel on the whole KZbin

[@CodeVault]

Thanks!

[@wintersol9921]

I totally agree.

[@carriersignal]

Came here not expecting much, but after watching the video I actually understand what I came here for. Very clear and to the point. Thank you!!

[@omerozdemir1]

Happy to see you again!

[@biswajit07]

Thankx man! You saved my life. I read multiple links but could't understand because all of them had different answers regarding these two terms.

[@wintersol9921]

I am so happy to see you back. I think that your video series on C is the best on youtube. Your knowledge on C is the best compared to other youtube channels. What will your next videos be about? I am asking because I want to set my study contents according to that. I want to watch them all. Also, I want to thank you because you helped me a lot with my computer courses. You are a true hero :D

[@CodeVault]

Thanks! I was thinking of having the next series be about object oriented programming (OOP) using C++. What do you think about that? Or would you like to see OOP in another, more modern, language?

[@wintersol9921]

@@CodeVault Well, since you have great knowledge in C, you probably have it also in C++. It would be really fun to learn C++ from you. I really like the way you teach, and I am sure many others think the same way. There are a lot of videos about OOP in modern languages like java and python. Those languages are a lot easier to learn, you can even learn them from websites. But when it comes to C or C++, it is nearly impossible to really comprehend what is really going on. You can't really understand the main thing by just reading it. I always end up in your videos when I need to look up at something about C. So I think C++ would be a nice topic for your next videos.

[@onesome7713]

It's Perfect video i've been looking for.. Thank you sooooo much!!

[@SnowFlameSupremacy]

Superb video...from the title i thought it would be a mundane topic but i was able to learn new things....amazing work

[@Ridful]

Really good explanation, thank you!

[@cyrilcycadiou9962]

that was very helpful thank u so much ♥

[@nipundileep1577]

You deserve more views

[@ruruanimations]

thank you that makes sense :)

[@meh....9661]

This guy contributed to my CS degree more than profs.

[@dimitrioskalfakis]

very good presentation.

[@user-pm4ng4wf8d]

Thank you for your explanation, Can I say Declaration = Describe & Definition = Allocate . I imagine Declaration like Authentication or point of check before allow something to allocate in memory

[@CodeVault]

Yeah, that should be fine. It's just not quite correct when talking about functions

[@manuelmigoya2109]

@@CodeVault Can you explain why?

[@justcurious1940]

from what I understood extern int x ; is a redeclaration of x that could exist inside the same file or in an other file ? but how a declaration of a variable looks like ? is int x ; inside main is a declaration or a definition ? int x ; outside main is a tentative definition and x will be initialize to 0 by default ?

[@CodeVault]

int x; is both a definition and a declaration (both outside and inside) extern int x; is a declaration without the definition Don't mix up initialization with definition/declaration btw

[@justcurious1940]

@@CodeVault Yes, thank u for replying I get it now, please keep uploading your videos are ez to follow.

[@DXenakis]

You are the C standard on utub