//---------------------------------------------------------------------------
//A driver program for testing a class named "square_bar"
//It inputs the side_dimension and height of a square_bar,
//while outputs the volume and surface area of that square_bar
//Prepared by Dr Jan Pajak, at ..., on ....
//---------------------------------------------------------------------------
#include <iostream.h>
#include <conio.h>
#include <cstdlib>
//Class definition
class square_bar
{
public:
        square_bar();                //class constructor
        void get_data(float, float); //member function for data input
        void calculate_volume();     //member function for volume calculation
        void calculate_surface();    //member function for surface calculation
        void display_results();      //member function for displaying results
        ~square_bar();               //class destructor
private:
        float side_dimension;//declares a side_dimension of a square_bar (input)
        float height;      //declares a height of the square_bar (input)
        float volume;      //declares a volume of the square_bar (output)
        float surface;     //declares a surface area of a square_bar (output)
};
//---------------------------------------------------------------------------
square_bar::square_bar()   //the constructor - it sets default values
{
        side_dimension = height = volume = surface = 0.0;
}
void square_bar::get_data(float a, float h) //this member function inputs data
{
        side_dimension = a;
        height = h;
}
void square_bar::calculate_volume()   //this member function calculates the volume
{
        volume = (side_dimension * side_dimension) * height;
}
void square_bar::calculate_surface()  //it calculates the surface
{
        surface = (4.0 * side_dimension * height) +
                  (2.0 * side_dimension * side_dimension);
}
void square_bar::display_results()    //it displays results
{
        cout <<"\nThe volume of the square_bar is: "<<volume<<endl;
        cout <<"\nThe surface area of the square_bar is: "<<surface<<endl;
}
square_bar::~square_bar()   //the destructor - it destroys the object
{
        cout <<"\nThe bar object was destroyed!" <<endl;
}
//Functions headers
void display_end(void);  //this declares that there is a "file scope" function
//Follows a driver program that tests the square_bar class
int main()
{
        square_bar b; //creates an object for this class
        float a, h = 0.0; //declares and initiates variables to be used
        cout <<"Enter a side_dimension of a square_bar : ";
        cin >>a;
        cout <<"Enter the height of the same square_bar: ";
        cin >>h;
        b.get_data(a, h);        //inputs values for variables
        b.calculate_volume();    //calculates volume
        b.calculate_surface();   //calculates surface
        b.display_results();     //displays results
        b.~square_bar();         //destroys the square_bar object
        display_end();           //runs the "file scope" function to report end
        return 0;                //this is needed as main() is int not void
}
void display_end(void)           //defines the "file scope" function
{
        cout <<"\nThe correct end of run of that program!\n";
        system("pause");
}
//---------------------------------------------------------------------------