Chapter 7: Problem 46

include using namespac… # A) class Circle: 1 private double centerX: double centerY: double radius: public setCenter (double, double): setRadius (double) : } B) #include using namespace std: Class Moon: { Private: double earthWeight: double moonWeight: Public: moonWeight (double ew) \(; / /\) Constructor ( earthWeight \(=\) ew \(;\) moonWelght \(=\) earthWeight \(/ 6: 1\) double getMoonWelght(): ( return moonWeight: } int main () 1 double earth: }

Short Answer

Expert verified

The private attributes for the Circle class are: - double centerX - double centerY - double radius The public methods for the Circle class are: - void setCenter(double x, double y) - void setRadius(double r)

Step by step solution

Declare the Circle class with its private attributes and public methods.

To declare the Circle class with its attributes and methods, begin by writing the class keyword followed by the class name (Circle). Then, list the private attributes (centerX, centerY, and radius) and public methods (setCenter() and setRadius()) as follows: ```cpp class Circle { private: double centerX; double centerY; double radius; public: void setCenter(double x, double y); void setRadius(double r); }; ```

Implement the public methods of the Circle class.

Now that we have declared our Circle class along with its attributes and methods, we need to implement the public methods setCenter() and setRadius(). ```cpp void Circle::setCenter(double x, double y) { centerX = x; centerY = y; } void Circle::setRadius(double r) { radius = r; } ``` #Task B: Create Moon class#

Declare the Moon class with its private attributes and public methods.

To declare the Moon class with its attributes and methods, begin by writing the class keyword followed by the class name (Moon). Then, list the private attributes (earthWeight and moonWeight) and public methods (Moon() constructor, and getMoonWeight()) as follows: ```cpp class Moon { private: double earthWeight; double moonWeight; public: Moon(double ew); double getMoonWeight(); }; ```

Implement the Moon class constructor and getMoonWeight() method.

Now that we have declared our Moon class along with its constructor and method, we need to implement the Moon() constructor and the getMoonWeight() method. ```cpp Moon::Moon(double ew) { earthWeight = ew; moonWeight = earthWeight / 6; } double Moon::getMoonWeight() { return moonWeight; } ```

Write the main() function.

Write the main() function that will prompt the user to enter their weight on Earth and then output their weight on the Moon. ```cpp #include using namespace std; int main() { double earth; // Input weight on Earth cout << "Enter your weight on Earth: "; cin >> earth; // Calculate and display weight on Moon Moon m(earth); cout << "Your weight on the Moon is: " << m.getMoonWeight() << " units." << endl; return 0; } ```

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Short Answer

Step by step solution

Declare the Circle class with its private attributes and public methods.

Implement the public methods of the Circle class.

Declare the Moon class with its private attributes and public methods.

Implement the Moon class constructor and getMoonWeight() method.

Write the main() function.

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