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Circle Class - Version 1
% cat circlass1.cpp
// Circle class example
// using two constructors
#include <iostream>
#include <iomanip>
using namespace std;
// class definition
class Circle
{
public:
Circle();
// default constructor
Circle(int x, int y, double r); // constructor
void showdata();
private:
int xcenter;
int ycenter;
double radius;
}; // note the semi-colon
// class implementation
// default constructor
Circle::Circle(): xcenter(0), ycenter(0),
radius(1.0)
{
// empty body when initialization
// section is used
}
// constructer with parameters for initialization
Circle::Circle(int x, int y, double r): xcenter(x),
ycenter(y),radius(r)
{
// empty body when initialization
// section is used
}
void Circle::showdata()
{
cout << setiosflags(ios::fixed | ios::showpoint ) << setprecision(2);
cout << "The circle is centered at (" << xcenter <<
", "
<< ycenter << ")" <<
endl;
cout << "Radius = " << radius << endl;
return;
}
// calling program
int main()
{
// declare objects a (use default values)
// and b (provide initial values)
Circle a, b(3, 4, 4.0);
// call member function
cout << "Circle a: " << endl;
a.showdata();
cout << "\nCircle b: " << endl;
b.showdata();
return 0;
}
% g++ circlass1.cpp
% a.out
Circle a:
The circle is centered at (0, 0)
Radius = 1.00
Circle b:
The circle is centered at (3, 4)
Radius = 4.00
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