Help With Classes

[Derek VW]

I'm trying to write a class to figure out the parameters for a rectangle or arch window. I need some help with the class. I'm having some difficulty calling variables defined in one method to another method in the same class.

Any help is appreciated!

#include <iostream>
#include <iomanip>
#include <conio.h>
#include <ctype.h>
#include <math.h>
//#inlcude Arch_Rect_Win.h

using namespace std;

class Arch_Rect_Win
{
    private:
        double pi;
       
    public:
        Arch_Rect_Win(double =0);
        void setWidth(double);
        void setHeight(double);
        void setPPSI(double);
        double getHeight() const;
        double getWidth() const;
        double getArea() const;
        double getPrice() const;
        double getPricePSqIn() const;
        
};

int main ()

{
    Arch_Rect_Win aWin;
    char h[10], w[10], p[10];
    char rORa[10];
    int validData;
    
    //textcolor(BLUE);
    //textbackground(LIGHTGRAY);
    
    system("CLS");
    
    do
    {
        cout << "\n\t ENter Window Height: ";
        cin >> h;
        cout << "\t Enter Window Width: ";
        cin >> w;
        cout << "\tEnter Price Per Sq In: ";
        cin >> p;
        cout << "\tEnter ""A"" for ARch, ""R"" for Rectangel: ";
        cin >> rORa;
        validData = aWin.setData(h,w,p rORa);
        
        if (validData !=0)
        {
            cout << "\n\tError in Data!";
            cout << "\n\tMust enter either ""A"" for ARch or ""R"" for Rect";
            cout << "\n\t\tIf Arch Windows, height must be >= half of the width ";
            cout << "for arch window\n";
        }
    }while (validData !=0);
    
    system("CLS");
    
    if (aWin.getRectOrArch() == 'A')
        cout << "\n\t\t* * * Arch Window * * *\n";
    else
        cout << "\n\t\t* * * Rectangle Windows * * *\n";
        
    cout << setiosflags(ios::showpoint | ios::fixed) << setprecision(2);
    cout << "\n\t           Height: " << aWin.getHeight();
    cout << "\n\t            Width: " << aWin.getWidth();
    cout << "\n\t  Price Per Sq In: " << aWin.getPricePSqIn();
    cout << "\n\t       Total Area: " << aWin.getArea();
    cout << "\n\t      Total Price: " << aWin.getPrice();
    getch();
} 

Arch_Rect_Win::Arch_Rect_Win(double height, double width, double ppsi1)
{
    setHeight(height);
    setWidth(width);
    setPPSI(ppsi1);
    pi = 3.14159;
}

void Arch_Rect_Win::setHeight(double height)
{
    if (height>=0)
    h=height;
}

void Arch_Rect_Win::setWidth() (double width)
{
    if (width>=0)
    w=width;
}

void Arch_Rect_Win::setPPSI() (double ppsi1)
{
    if (ppsi1>=0)
    p=ppsi1;
}

double Arch_Rect_Win::getHeight() const
{
    return height;
}

double Arch_Rect_Win::getWidth() const
{
    return width;
}

double Arch_Rect_Win::getPricePSqIn() const
{
    return ppsi1;
}

double Arch_Rect_Win::getArea() const
{
    double radius = width/2;
    double AreaofArch = (pow(radius, 2.0) * pi)/2
    double LengthRectangle = height - radius;
    double AreaofRectangle = LengthRectangle * width;
    double TotalArea = AreaofRectangle + AreaofArch;
    return TotalArea;
}

double Arch_Rect_Win::getPrice() const
{
    return ppsi1 * TotalArea;
}

[BlackSheep]

You need to declare the data as a member of the function. For example:

Foo.h

class Foo
{
private:
int MyInt; //Declaring this data as part of the function allows you to access it in any of the classes functions.
float MyFloat;
public:
int GetInt(); //Both GetInt
void AddOneToInt(); //And AddOne would be able to access the same variable "MyInt".
float GetFloat();
};

So now in your .cpp file:

Foo.cpp

#include "Foo.h"

int Foo::GetInt()
{
return MyInt; //You can just call the variable by the name that it was given in the class definition.
}

void Foo::AddOneToInt()
{
++MyInt; //Here we are manipulating the exact same variable. If GetInt was called after AddOne was //called the returned value would be one bigger.
}

Just remember that if you put data in the public section of a classes members it can be accessed just like in a struct:
If MyInt was public this:

int main()
{
Foo Test;
Test.MyInt = 0; //Would be perfectly legal, and now a call to GetInt would return 0.
return 0;
}

EDIT:
So for your code you would want something like:

class Rect
{
private:
int width,height;
double pi;
//Any other private data or functions.
public:
//All your public functions, for example to access the private members.
};

Just keep in mind that if your class isn't too complicated it can just bloats the class to have special accessing functions for every variable. Just make them public.