Can't understand some syntax...

[hentaiw]

In the :

class polynomial{
	public:
		int coeff;
		int expo;
		class polynomial *next;
//Declaring the functions within the class
		polynomial input();
		polynomial output();
		polynomial addition(polynomial poly);
		polynomial multiplication(polynomial poly);
		polynomial subtraction(polynomial poly);
};
class polynomial x, y, z;

Can't understand :

class polynomial *next;

Do I need the word "class" here ?

class polynomial x, y, z;

What is this ? Why put it after the class declaration ?

Thanks in advance...

[Moschops]

Do I need the word "class" here class polynomial *next; ?

No. It's like putting struct in front when you create an instance of a struct. It works, but it's not necessary.

What is this class polynomial x, y, z; ? Why put it after the class declaration ?

This is someone creating three instances of polynomial type; they are named x, y and z.

It's like this:
int x,y,z;
but instead of making ints, making polynomials. They could have done this instead:
polynomial x, y, z;

[TheMassiveChipmunk]

I am not sure but in C you put struct before declaring an object of that struct I am guessing you can do the same with classes but I know you do not have to you can just write polynomial x , y , and z. I may be wrong though.

Ooops Moschops beat me to it...

[hentaiw]

Thank you !

class polynomial x, y, z;

This line is outside int main() or any other function,so is it useless ?
Or is it global variables or such ?

[Moschops]

This line is outside int main() or any other function,so is it useless ?

No. It create three instances of type polynomial outside the scope of everything. They are what is known as "global variables". They are bad and are to be avoided.

[hentaiw]

Yes of course,thanks guys,marked this as solved !