What does int argc, char* argv[] mean?
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- เผยแพร่เมื่อ 4 ต.ค. 2024
- In this tutorial I explain the meaning of the argc and argv variables that are often passed in the main function of a C or C++ program.
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![All you need to know about the command line arguments argc and *argv[ ]](http://i.ytimg.com/vi/AwoA3EPOxM4/mqdefault.jpg)
Argc is ARGument Count and and argv is ARGument Vector.
And "Vector reffers to an array, not a C++ or Euclidean vector"
See reference here:
www.cplusplus.com/articles/DEN36Up4/
Ps.: Although the name of the site be cpluplus.com, all the teachings contained there are compatible with C.
Kingsman is KINGdom's MAN.
is he managing directory by programming ?
what are counts and vectors in C?
@@hetaeramancer I tried to print the argv it shows the path of some designated file
Never understood it until I saw you video 👌👍
I couldn't understand this for so long, I read some stack overflow, watched some tutorials, looked up some problems and nothing helped until I found this video, great explanation!! Feels way better to finally understand this
You CAN declare a variable inside a for loop in C. Just use C99 or C11.
@Artem Katerynych It's a standard that the compilers have to follow. it's not a version
@Artem Katerynych Well technically we're both late.
@@nicolareiman9687 yes
@@nicolareiman9687 it is a version, if you define it to be "[a] particular form or variation of an earlier or original type" (American Heritage Dictionary, 5th Edition). It's not a version of a particular C implementation -- such as a compiler or standard library -- but it is a version of the C language.
Edit: And I'm also a year late, lol.
i was about to. To be honest i dont get why ppl dont use c99. I just dont get it. If anyone can explain i will apreciate it alot
I want this guy to explain literally everything in my life
Hey Paul, I'd like you to thank for putting your energy into making this tutorial. It was really enlightening and it made me comprehend the concept much better. Keep up the awesome job.
This scared me in the past to start with c++, but it's actually such a simple concept.
Thx Paul.
I recall Jullian Assange saying, "commitment requires sacrifice, courage is contageous". (The latter meaning if you surround yourself w/ your peers, courage is contageous).
This said, while learning to code, (we're ALWAYS students however), we forget previous lessons etc, the "commitment" part is, constantly reviewing what we may forget.
This said, THANK YOU for your great work here on TH-cam.
Cheers
T
You are literally the best my professor expected most of us to know c and it took me about 2 weeks on an assignment because i couldn't figure this out but bc of u i have been able to solve the task on the assignment. Thank u.
I remember being so intimidated by this when I started learning C++. But then I learned that I didn't need it at all and I forgot about it completely.
so do i have to learn this or what bro i am a cs student who are a completely beginner :)
@@ibrahimozmen9668 unless you are building commandline applications for Linux or old terminal based systems, you don't need to worry about it.
@@mistakenmeme thanks bro. I just wanted to learn how it works
Awesome video! I'm brazilian and I want you to know that your video are healping people from all around the world! Thank you very much!
This is the clearest explanation I have ever seen on this particular item !
You are better at explaining than my actual teachers. +1 sub
maybe you mean sub++ ( I know, I'm not funny)
excellent explain.
Man, you are amazing! You really know what you're doing. Please, don't stop!!!
I have been searching so much for this, even my book doesn't explain what is this, thx a lot
Quite a lucid explanation. Thanks Paul for making such an awesome video. You've gained a subscriber.
That's very simple by listening you. Love the away you explain think. Nice work
OMFG I was reading about this for like 1 hours and couldn't understand shit, and you made it so clear!!! Thank you!!
Very clear, concise, to the point, intelligible. Many thxs
You actually can declare a variable in a for loop in C
And, how did you use your atoi(). Is it a std function from a C library.
Thanks for this video. You actually made effort to make this concept as simple as possible
yes it is, from stdlib.h
@@franchezke2351 yea, I found out. Thanks
My friend, in C you can declare "int i=0" in the for loop. Wish you the best!
Alexandru Dinu yes, but that variable would be deleted as soon as the for loop finishes!
@@ledues3336 Can you please explain a bit more? or point to the right source? Because CS50 does the same as Alexandru mention above.
@@ledues3336 Yes, this is the intent.
Mindblowing! First I wondered what it was in Java, then in C# and now I finally got the answer in C++ :)
it's actually C
@@frogsam4228 it's identical in this case
@@adamodimattia Idk tbh bcz I know nothing about c++
but I'm sure that the format of main itself is different also the standard library is iostream right?
so I guess they can't be identical right
@@frogsam4228 it is, but also in C++ you can use everyting what is in C, all the C libs too
@@adamodimattia ooh I didn't know that
thanks a lot
thanks, i sleep thru my last lecture, this clears a lot!
Thank you, very clear and concise explanation.
Thank you for your video! I'm French and it's super easy for me to understand everything. You took your time to be understandable and thank you so much for that!
always provide notes to things you have spoken makes us understand better okay 👍
thank u so much for your efforts
love from india
i always declare variables in for loops in c
so clear and excellent explanation.
Just to mention that the arguments must have a space or TAB between them and not a ; or ,
Oh my god you are my hero!!! thank you so much bro... subscribed already
I'm new in porgramming and this video show me for what is this argc and argv. But for what need argc to count his own call from the elter process?
SO WELL-EXPLAIN that I just signed in to give you a thumb-up!!! Thank you for the clear explanation.
If you are not already, you should be a teacher. This is insanely clear.
You explained this way better than my teacher.
(In C programming it is not necessary to put in a for loop the type of the value...) Very good tutorial!!
Bro holy shit. I misunderstood arg c and argv when i first heard it. But god damn now i finally know how to use it. Thank you so much
Cool, this confirmed my book seemed weird that it said this had to double check. good job.
This video was so helpful with understanding my embedded systems homework. Your video really clears some things up. Thanks so much!
No words to explain. !!! Thanks a lot!!!!!
really helpful, although the if loop seems unnecessary. If the argc
Explicitly explained! Thank you paul!
Brilliant explanation, Paul! You just got yourself a new subscriber!
Great explanation, most of the university professors can't explain this.
Thank you for this excential explanation!!
Paul, A nice clear intelligent presentation.
Well done and thank you!
(Props also to Hassanin Ahmed, below.)
Thanks works fine. Greetings from Italy
Well explained Paul. Thanks.
BRAVO! Thanks so much sir.
From ALX AFRICA
Nice Explanation!
Thanks for the explanation, God bless you!!!
good one
i can put scanf back on the shelf and just pass values in when i run stuff
many thanks for sharing your knowledge
subbed
EXCELLENT video, just subscribed. thanks
Did you make a C programming tutorial? You explanations are so clear
You just got a new subscriber thanks Paul
Main question remains unanswered, Why do we use outside run argument from command line, when we could easily get the same output by conventional way
That is rather about personal wish, many programs are designed to check if argc ==0 if it is then manually ask for the inputs, it's for them who need their work done quick
We use g++ something.cpp and we are also providing input at commandline rather than
g++
g++ : Enter name of file to be compiled - something.cpp
We use it cuz some programs dont support manual input or personal wish
Thanks, this has confused me and I have it on my exam. You cleared it up :)
Thanks Paul for this insightful video 😊.
Thank you very much. The video was clear, easy to understand, and helpful!
finally the first helpful vid on this topic!
perfect lecture!~thank you, Paul~~~~~
You say you can't use 'int' inside your declaration of a for loop: for (int i = 0; ;) Yet I've never had an issue with it in C. I do it all the time. No problems ever.
Thank you. Your teaching had a very clear progression from basic code to more complex code.
I learn something today! Good explanation. Thanks!
So clear and simple ❤
What is -o😂
@@AndrewChapman-j6pum... "Output" maybe?
excellent explanation.I've also seen some "cousins" of this. Can you tell me what is the difference between the following?int main(int argc, char* argv[])int main(int argc, char *argv[])int main(int argc, char** argv)int main( int argc, char **argv)
This is very late, but I got recommended this video, so this is for anyone reading. Spaces don't matter when placing the asterisk in a pointer declaration.
Also, technically, the C library passes a pointer to a pointer to main, hence the **argv. The array definition (with the brackets) is just syntactic sugar and makes it more understandable. You can test this by calling sizeof(argv). If it's actually an array, the size of the array would be stored on the stack, but it's actually just of type char**, so it'll return 8 on a 64-bit machine (which is the size of a pointer). The memory addresses to the strings are just stored one after the other.
@@NateROCKS112 does that mean **argv and *argv[] both indicate pointer to pointer?
@@DbCo0pEr yes. To my knowledge, in C, when you declare an array as a function parameter (e.g., void my_function(int my_array[]);), the array "decays" into a pointer. So it's purely syntactic sugar in that case. Edit: However, it can help to think of it as an array conceptually, and the type declaration still appears in documentation. I would personally use char *argv[] for that reason. Edit 2: I did want to note that normal arrays, such as within the same function scope, are slightly different from pointers, mostly in that sizeof actually gives the size of the array. So it's not just syntactic sugar in that case.
@@NateROCKS112 You have to really know what you are doing . What the compiler sees and what you see aren't always a matchup , take obfuscated C for example , the compiler knows exactly what to do even though you may have no idea whatsoever by reading the code . That's why so many people are afraid of C !
good explanation. well understood. thanks man
Thank you, from Turkey.
Bro, thanks for details explanation.
thanks a lot!!! so nice reverb
Thank you so much for the help!
Thanks so much dude，it really helps me in terms of my final...
Real savior!!!! Thank you!!!!
Very good explenation!
Thank you. Pretty decent explanation.
Thanks for this tutorial!!! It helps a lot!
Thanks it is very well explained
Thanks to share!
great explanation
Very helpful
Thanks a lot
If you could make a video for pointer to function,
it will great
This is great! thanks from India paul
great explanation
understood in one go...
Thanks for the explanation I get it, but why is it required? What happens in the background process?
You are a Hero. Are there any video list about similar topics about visualization, linux and bash etc.
Thanks super clear explanation !
Really helpful, thanks!
Wow makes so much sense now. Thank you!
Well and clear explanationn...
Thank you so much! Very clear explanation.
thanks that was cool
but I want to say that I'm sure that if you declare int i inside the initialisation part of the loop that'll work in C
I do it everytime
and for the "if condition" part
I guess you already know but I want to say it 😅 there's no need for that condition at that level bcz the loop start from 1 and the condition is strictly smaller than argc so if the argc is smaller than 1 the loop won't start at first place
nice, when i took intermediate programming last semester my instructor insisted we all knew how to use argv and argc lol. should be very helpful to newer programmers.
Perfectly understood
i don't how to thank you. Thaaaaaank yoooooooou soooooooo much
Thank you for this video
best video explaining this! thank you
excellent examples and explanations cheers!
Perfectly explained, thx a lot bro!
You are just amazing bro, thank you so much, you helped me a lot!
Great explanation, thanks.
fantastic explanation!
Thanks 👍👍👍👍