global variable

[lufthansa747]

i know it is a bad way to code but i am too lazy to do it the right way. i need to use a variable inside a class but it has been declaed in the main program how do i accses it

[Zren]

You import the variable into the class.

Turing:

var str : string := "what" class dude     import str     export print     procedure print         put str     end print end dude var guy : pointer to dude new dude, guy guy -> print

[andrew.]

I have a question that's kind of related to this. I'm used to OOP in Java, so is there a way I can have Turing OOP have a constructor so that I can set some values when creating the object? Or do I have to use a global variable and/or my own method for initializing the variable?

[Zren]

There's no constructor/you have to make your own method. It's lame I know.

[Superskull85]

Well the way you construct an object in Java is by essentially calling a method via the use of the keyword "new." So by creating your own method and than calling you are essentially doing the same thing as you would do in Java for the most part (plus writing one or two extra lines).

[andrew.]

Yeah, I figured I would have to do that. Oh well, I guess that's why OOP in Turing isn't really a good idea.

[lufthansa747]

ok but what if i want to acsess another class and edit some of its info form a different class how do i do that

[mirhagk]

to answer the originally question, wouldn't you import it? I'm pretty sure you can import values from other classes as well, so you could do that i guess.

[Superskull85]

@ lufthansa747,

Do you mean inheritence?

Turing:

class Foo     export Hello     proc Hello (Name : string)         put "Hello, " + Name + "!"     end Hello end Foo class Foo2     inherit Foo     export HelloWorld     proc HelloWorld ()         Hello ("world")     end HelloWorld end Foo2

Or do mean reopening a class during run time? You cannot do the latter in Turing, but you can inherit other classes, as shown above.

@ mirhagk,

Kind of defeats the purpose of classes and objects though. The point of Object Oriented Programming is to treat each object as its own world where nothing else except that object can change the contents of that world. If you allow sharing of data, that has not been asked for, than its like merging two different worlds together where each world does not know for certain if their contents are valid. One world can change the other and vise versa.

The best way to retrieve data from an object is to ask for it via a function and not by sharing writable variables.

[mirhagk]

i know that would be the right way, but he asked how to access a global variable within a class. But the proper would to do it would be something like

Turing:

function double(num:int):int   result num*2 end double

and in your main program it'd look like the following
[syntax="turing"]
var mynum:=5
mynum:=double(mynum)
[/sytnax]

obviously you'd need to change that so it's OOP but that's basically how to do it