There are three types of languages (in this sense):

• One type does not support OO at all, for example c. (However I will later tell you why actually c supports OO at least to a certain level, I will talk about this as a side note);
• One type supports OO, but still allows you to code in a non-OO way, for example c++ and Perl. (Although the OO in c++ and Perl are actually quite different, we disregard this in the current context);
• One type supports OO, and leave no way for you to code in a non-OO way (at least from a syntax point of view), for example Java.

Now I think it is interesting to know others’ thought as which way is better between the last two. Do you like a language that allows you more freedom (like c++ and Perl), or a language enforce more discipline (like Java). Why?

Side note:

Now why I said c actually supports OO in some sense. In our company, we have lots of c code left from a while ago, and now when we add new functions to the existing system, we still code in c (partly because we have to deal with Oracle pro*c). But I proposed a way to code c program in a OO-style, and people like it.

What we do is:

• First we analyze the situation as if we are doing OO design, so we get all the classes, properties, and methods
• we create a struct to contain all the properties for each class;
• This structure, let’s call it self structure is passed to each function (method) as the first parameter, so now all the function (method) knows about all properties;
• In the self structure we also keep pointers to all methods, in this way overload methods becomes as simple as modifying a pointer.

It is just that simple, and all our new c programs are now in this way.

Now this is actually very close to how OO is supported in Perl.

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