Math not processing entries properly

iceman2006 · #1 26-Apr-2006, 02:45

I am trying to use a derived class to:

1. enter an X and Y point, then print out the points
2. enter a radius, then print out the radius, diameter and circumference

As you probably can tell I am very new to programming. I looked at some related posts and tried to incorporate them into my code. However, I am missing a something. I need help with that "something".

When I run the program it apprears as if everything is working until the results for each of the outputs. It seems as if the math is not processing the entries properly.

Any help would be appreciated.

Thanks.

btw I am using DevC++.

CPP / C++ / C Code:

#include <iostream>
#include<string>
#include <cmath>

using namespace std;


// The pointType class declaration (base class)
class pointType
{
public:
	void setX(int xCoord);
	void setY(int yCoord);
             void setRadius(double radius);
	void print();
	int x;
	int y;
	double r;

};
// end of the PointType class declaration


// Beginning of the circleType class declaration (derived class)
class circleType : public pointType
{
public:
	double diameter();
	double circumference();
	void print();
	int x;
	int y;
	int r;

};
// end of the CircleType class declaration

// Beginning of the PointType constructor
void pointType::setX(int xCoord)
{
	x = xCoord;
}
void pointType::setY(int yCoord)
{
	y = yCoord;
}
void pointType::setRadius(double radius)
{
	r = radius;
}

void pointType::print()
{
	cout<<"\nThe X and Y coordinates are: "<< x <<","<< y <<"\n";
	cout<<"\nThe radius is: "<< r << "\n";

}
// End of the PointType constructor

//Beginning of the CircleType constructor
double circleType::diameter()
{
	return (2 * 2);
}
double circleType::circumference()
{
	return (r * 2 * 3.14);
}
void circleType::print()
{
	cout<<"\nThe diameter of the circle is: " << diameter() <<"\n";
	cout<<"\nThe circumference of the circle is: " << circumference() <<"\n";
}
int main()
{
	pointType pointInfo;
	circleType circleInfo;
	int yCoord;
	int xCoord;
	double radius;
	cout << "Enter the X coordinate: " <<"\n";
	cin >> xCoord;
	cout << "Enter the Y coordinate: " <<"\n";
	cin >> yCoord;
	cout << "Enter the radius of the circle: " <<"\n";
	cin >> radius;
	
    pointInfo.print();
    circleInfo.print(); 
    system("PAUSE");
	
	return 0;
}

LuciWiz · #2 26-Apr-2006, 02:55

Where do you set the values of the object members? You acquired the input from the user, but never copied the values to the objects. Look at the print function: it uses some variables, which you must assign a value too; what member functions would you use to set the variables, and where?

Best regards,
Lucian

iceman2006 · #3 26-Apr-2006, 11:21

Thanks for the help. It seems to be working fine now.

CPP / C++ / C Code:

#include <iostream>
#include <cmath>

using namespace std;

// The pointType class declaration (base class)
class pointType
{
public:
    void setCoords(int xCoord, int yCoord);
	void print();
	int x;
	int y;
};
// end of the PointType class declaration

// Beginning of the circleType class declaration (derived class)
class circleType : public pointType
{
public:
	void setRadius(double radius);
    void print();
	double r;
    double radius();
    double diameter();
	double circumference();
};
// end of the CircleType class declaration

// Beginning of the PointType constructor
void pointType::setCoords(int xCoord, int yCoord)
{
     x = xCoord;
     y = yCoord;
}
void pointType::print()
{
	cout<<"\nThe X and Y coordinates are: "<< x <<","<< y <<"\n";
}
// End of the PointType constructor

//Beginning of the CircleType constructor
void circleType::setRadius(double radius)
{
     r = radius;
}
double circleType::diameter()
{
	return (r * 2);
}
double circleType::circumference()
{
	return (r * 2 * 3.14);
}
void circleType::print()
{
	cout<<"\nThe radius is: "<< r << "\n";
	cout<<"\nThe diameter of the circle is: " << diameter() <<"\n";
	cout<<"\nThe circumference of the circle is: " << circumference() <<"\n";
}
int main()
{
	pointType pointInfo;
	circleType circleInfo;
	int yCoord;
	int xCoord;
	double radius;
	cout << "Enter the X coordinate: " <<"\n";
	cin >> xCoord;
	cout << "Enter the Y coordinate: " <<"\n";
	cin >> yCoord;
	cout << "Enter the radius of the circle: " <<"\n";
	cin >> radius;
	pointInfo.setCoords(xCoord, yCoord);
	circleInfo.setRadius(radius);
	
    pointInfo.print();
    circleInfo.print(); 
    system("PAUSE");
	
	return 0;
}

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