Simple c++ class help

need help, this is my 2nd prog. I'm trying to create a class and use it to find the area and length of boundary. I got no errors but 3 warnings and the calculation came out wrong...please help

#include <cstdlib>
#include <iostream>

using namespace std;

//==================class begins=========
class plot {
private:
int length;
int widht;

public:
int area(int, int);
int boundary(int, int);

};

//======================ends class=======

//==========================plot constructor initiate===================
plot::area(int x, int y)
{return x*y;}

plot::boundary(int x, int y)
{return 2*(x+y);}

//=========plot constructor end============
//========main=================
int main()
{
plot z;
int x=7;
int y=9;
cout<<"Area is: "<<z.area<<endl;
cout<<"Length of boundary is: "<<z.boundary<<endl;
cout<<"\n";
return 0;
}

Changing this:

into:

and this:

into:


worked for me.

will I be good like you one day? How long have you been doing what you're doing? I just feel so overwhelming sometimes. Thank you very much.