passing variables between classes

[beginner3]

I am new to object oriented programming and am having a difficult time trying to figure out how to pass a public variable to another class. I have the #include"filename.h" on the class trying to access the variable from the first class. This variable is just an int set to a number. Any help is appreciated.

[gunnerfunner]

assuming public variables in both classes, here are some suggestions about passing static and non-static variables from class A to class B. you can have other scenarios based on combinations of public and private access in each class:

#include <iostream>

class A
{
    public:
        static int staticVar;//not attached to an instance of A
        int nonStaticVar;//always comes attached to an instance of A
};

int A::staticVar = 42;

class B
{
    public:
        int b_staticVar = 0;
        int b_nonStaticVar = 0;
};

int main()
{
    B b;
    b.b_staticVar = A::staticVar;
    std::cout << b.b_staticVar << "\n";//prints 42;
    std::cout << b.b_nonStaticVar << "\n";//prints 0 (default value)

    A a;
    a.nonStaticVar = 24;
    b.b_nonStaticVar = a.nonStaticVar;
    std::cout << b.b_nonStaticVar << "\n";//prints 24
}

the other thing that you might also wish to look up on to see if that meets your requirements is classes having objects of other class(es) as its data members - this is known as containment or composition -
http://www.learncpp.com/cpp-tutorial/102-composition/