Inheritance in C++

[shaheda begum]

Do we have some provision in C similar to inheritance in C++???Thank you in advance.

[Savage]

Do we have some provision in C similar to inheritance in C++???Thank you in advance.

C is not OOP language in general(but with little more effort you can almost use it as if it is),but you should be able to inherit from the struct,because struct is nothing but a class where all members are public.

Savage

[Andr3w]

If I am not mistaken what he means is that you are allowed to do the following

struct a {
  int a, b;
};
 
struct b {
 struct a inheritLike;
 char b;
};
 

now later in your program or function you could write

struct b foo_struct;
 
 // more stuff
 
 foo_struct.inheritLike.a = 0;
 

Hope this helped!

[Savage]

If I am not mistaken what he means is that you are allowed to do the following

struct a {
  int a, b;
};
 
struct b {
 struct a inheritLike;
 char b;
};
 

now later in your program or function you could write

struct b foo_struct;
 
 // more stuff
 
 foo_struct.inheritLike.a = 0;
 

Hope this helped!

No need for that,he can do:

struct a {
  int a, b;
};
 
struct b:a
{
    int c;
};

Now struct b has both a and b plus its own c,and can access them as if they were part of b and not of a.

b bInst;
bInst.a=bInst.b=bInst.c;

Savage

[Andr3w]

If I try to compile the following just fails...

struct a {
    int a, b;
};
 
struct b:a
{
    int c;
};
 
int main ()
{
   return 0;
}
 

I put what you gave as code to a simple just main program but it fails to compile. Can you help? But one thing I don't understand is how can I use " : " in order to inherit because ansi C it doesn't allow me to use that. Also for the above post I thought you meant with the term "inheritance in C" what I wrote before but I was wrong, sorry :p.

[Savage]

If I try to compile the following just fails...

struct a {
    int a, b;
};
 
struct b:a
{
    int c;
};
 
 
int main()
{
 
    b bInst;
    bInst.a=bInst.b=bInst.c;
 
 
    return 0;
}
 

I put what you gave as code inside a main function but it fails to compile. Can you help? But one thing I don't understand is how can I use " : " in order to inherit because ansi C it doesn't allow me to use that. Also for the above post I thought you meant with the term "inheritance in C" what I wrote before but I was wrong, sorry :p.

I tried TC,Borland C++ Builder 6(created c console app),and VC 2005 Pro.On all 3 this compiles.Can you tell me what you got as error?

Savage

[BigDaddyLH]

I tried TC,Borland C++ Builder 6(created c console app),and VC 2005 Pro.On all 3 this compiles.Can you tell me what you got as error?

Having one struct extend another is just a variation on one class extending another. You can't do that it C -- at least not ANSi C. If a compiler allows you, I bet it is regarding your code as C++.

In any case, for inheritance to really leverage, you need polymorphism. C doesn't have this -- it's not an object-oriented language like C++, Java, etc... Why pretend it is?

And maybe the real point, is why are you asking? What are you trying to do? what is your goal?

[Andr3w]

Well the compiler I used was Visual Studio 08 Team Edition, creating a Win32 Console Project, still doesn't compile

[alijannaty52]

It is possible to write object oriented programs in plain C. This is often
uglier, and more dangerous than doing it in an object oriented langauge but
you can do it.Hope below link will help you indeed.

http://aspspider.info/magicalspell4u/?Quest=C-Oops

-Thanks
52

[Andr3w]

As for reading stuff you can also find this book (it's free):
http://www.cs.rit.edu/~ats/books/ooc.pdf

[weaknessforcats]

Well the compiler I used was Visual Studio 08 Team Edition, creating a Win32 Console Project, still doesn't compile

Can't you just use .cpp files instead of .c files ??? That would compile your code as C++ and you could use inheritance.

Otherwise, you use an embedded struct member as has been suggested.

[Andr3w]

well, I suppose I could but then it would be a cpp program. Wouldn't it? The topic was if we could use inheritance in C in the first place :P

[weaknessforcats]

There is no inheritance in C.

Is there some reason you can't use C++??

[BigDaddyLH]

It is possible to write object oriented programs in plain C. This is often
uglier, and more dangerous than doing it in an object oriented langauge but
you can do it.Hope below link will help you indeed.

http://aspspider.info/magicalspell4u/?Quest=C-Oops

-Thanks
52

It's also possible to write object oriented programs in COBOL or assembler. But why not use a language that supports what you are trying to do? You still haven't described your problem adequately. What is the context, what are you trying to do and why?

I still think the answer is to use C++ or Java. Now what was the question?