Turbo are you alive?

#include<iostream> using namespace std; class A{ public: static int a; A(){ a = 1; } }; class B:public A{ public: B(){ a = 5; } }; int main(){ A a; cout<<A::a<<endl; B b; cout<<B::a; return 0; }

I'm doing this in cpp and compilation says:

(base) Ajays-MacBook-Air:Desktop ajay$ g++ static.cpp ^[[A^[[A^[[AUndefined symbols for architecture x86_64: "A::a", referenced from: A::A() in ccxRzWZ6.o A::A() in ccxRzWZ6.o B::B() in ccxRzWZ6.o _main in ccxRzWZ6.o ld: symbol(s) not found for architecture x86_64 collect2: error: ld returned 1 exit status

Can anyone explain?

you need to declare a

somewhere in the cxx file: int A::a = 0;

don’t name classes/whatever like that tho.

aa thaks dima love youe

hello dima

which a r you talking about

#include<iostream> using namespace std; class A{ public: static int x; A(){ x = 1; } }; class B:public A{ public: B(){ x = 5; } }; int main(){ A a; cout<<A::x<<endl; B b; cout<<B::x; return 0; }

Check this out

(base) Ajays-MacBook-Air:Desktop ajay$ g++ static.cpp Undefined symbols for architecture x86_64: "A::x", referenced from: A::A() in ccoNr3Em.o A::A() in ccoNr3Em.o B::B() in ccoNr3Em.o _main in ccoNr3Em.o ld: symbol(s) not found for architecture x86_64 collect2: error: ld returned 1 exit status

Do I need to declare the static x outside of the class

yes this is what I said

So, that means A::x=which value?

I mean inside the constructor I'm re-initialising x

So, which value should be set?

42

Or 69 based on your preference

hmm

Most people use 0 though.

How boring.

Anyone wants help?

We can make a project

Where to practice stl of c ++?

amazing, but you can do it anywhere)

but not in public place, be careful

Which is best c and c++ learning app tell me

And also tell me about function and pointer in c /c++

And also tell me about function and pointer in c /c++

Oh really? I mean you want me to write things in few lines that needs a whole course to understand?

Single line ohhhh god

And also tell me about function and pointer in c /c++

How should the reader interpret your question? One may assume you're asking for the definitions of these entities, in which case Google may help you faster.

Which is best c and c++ learning app tell me

Also, what kind of question is that? How should I interpret this? App for what? App where?

My opinion is that C would be easier to learn because it has less overall features, but its low level might put some off initially.

https://img.devrant.com/devrant/rant/r_1319179_RPWjn.jpg

https://img.devrant.com/devrant/rant/r_1319179_RPWjn.jpg

lol so true

Which is best c and c++ learning app tell me

Books

Books

Google... and YouTube.

Google... and YouTube.

Internet has a lot of shitty content which teach bad practices. But there are good resources available though

Which is best c and c++ learning app tell me

practical experience

guys any one here know regular expression ?

guys any one here know regular expression ?

It's not C++ related, but I think there's no regular expression for that language

It's not C++ related, but I think there's no regular expression for that language

Agree

I agree, the solution as state in the image is already the correct one

It can be easily parsed with one loop

It can be easily parsed with one loop

In theory, it only requires a stack automaton, but there's no way to parse it with regular expressions

In theory, it only requires a stack automaton, but there's no way to parse it with regular expressions

I think the point of the task is to check if given string is a correct expression of that language Am I correct?

I think the point of the task is to check if given string is a correct expression of that language Am I correct?

If you don't know what a regular expression is, stop and look on Wikipedia

I know what a regex is

What should regex check in this task?

What should it do*

give a regexp that match the same language

The language generated is n a's followed by the same amount of b's. By theory, there's no regex that can parse every word in that language

The language generated is n a's followed by the same amount of b's. By theory, there's no regex that can parse every word in that language

I understand it and I agree Just saying that it can be parsed with a loop

I understand it and I agree Just saying that it can be parsed with a loop

But that's not what the question is about

But that's not what the question is about

Yeah, you're right

Any friend give me FUD Android Rat

I don't have FUD on me.

Hi

What is the output of this program

What is the output of this program

read the rules, man

What is the output of this program

Think about it

What do you expect?

I'm learning template metaprogramming. Is it common in commercial usage?

kinda

What kind of applications can be built using c++?

What do you think?

Anything can be

What kind of applications can be built using c++?

If you mean C++ and only C++, anything from desktop applications to any type of server side application

Also AAA-games made with C++

But building one won't be much effective and efficient comparing to applications build using other languages right ?

I see

Thanks for the info

But building one won't be much effective and efficient comparing to applications build using other languages right ?

What?

Building one application using c++ won't be much better comparing to the applications built using other languages like Python