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# A class Coord has two attributes of x and y coordinates.

A class Coord has two attributes of x and y coordinates. The class has two member functions as defined below.

#include

class Coord {

private:

int x, y;

public:

Coord (int i1, int i2) : x(i1), y(i2) {

}

friend Coord operator- (Coord const& c1, Coord const& c2) {

return Coord(c1.x-c2.x, c1.y-c2.y);

}

Coord abs() {

return Coord(std::abs(x),std::abs(y));

}

int getX() {return x};

int getY() {return y};

};

/*Note int abs (int n); Returns the absolute value of parameter n*/

A base class GeoObj is for geometric objects.

class GeoObj {

public:

// return center of gravity of geometric object.

virtual Coord center_of_gravity() const ;

//...

private:

Coord center; // center_of_gravity;

};

a) A geometric class Circle and class Line is derived from GeoObj. Define and provide implementation of class Circle class and Line [10 Marks]. Define and provide implementation of a function template called distance that processes the distance of center of gravity between two objects of GeoObj [10 Marks]. The calculation is supposed to use the operator – for the center of gravity of two objects. The usage of this distance function is shown below.

int main()

{

Line l;

Circle c, c1, c2;

Coord d1 = distance(c1,c2);

Coord d2 = distance(l,c);

}

b) Define and provide implementation of operator << that outputs the type and center_of_gravity. For example, for a Circle object, the operator << outputs the type “Circle” followed by the X and Y coordinate of center_of_gravity. Likewise, for a Line object, the operator << outputs “Line” followed by the X and Y coordinate of center_of_gravity. You need to decide where (e.g. class GeoObj, class Circle or class Line) this operator << should be defined. This operator allows outputs to standard display such as the console or to a file.

c) Define a driver to test the class Circle, Line, function template distance and operator << overloaded for both cout and file streams.

#include

class Coord {

private:

int x, y;

public:

Coord (int i1, int i2) : x(i1), y(i2) {

}

friend Coord operator- (Coord const& c1, Coord const& c2) {

return Coord(c1.x-c2.x, c1.y-c2.y);

}

Coord abs() {

return Coord(std::abs(x),std::abs(y));

}

int getX() {return x};

int getY() {return y};

};

/*Note int abs (int n); Returns the absolute value of parameter n*/

A base class GeoObj is for geometric objects.

class GeoObj {

public:

// return center of gravity of geometric object.

virtual Coord center_of_gravity() const ;

//...

private:

Coord center; // center_of_gravity;

};

a) A geometric class Circle and class Line is derived from GeoObj. Define and provide implementation of class Circle class and Line [10 Marks]. Define and provide implementation of a function template called distance that processes the distance of center of gravity between two objects of GeoObj [10 Marks]. The calculation is supposed to use the operator – for the center of gravity of two objects. The usage of this distance function is shown below.

int main()

{

Line l;

Circle c, c1, c2;

Coord d1 = distance(c1,c2);

Coord d2 = distance(l,c);

}

b) Define and provide implementation of operator << that outputs the type and center_of_gravity. For example, for a Circle object, the operator << outputs the type “Circle” followed by the X and Y coordinate of center_of_gravity. Likewise, for a Line object, the operator << outputs “Line” followed by the X and Y coordinate of center_of_gravity. You need to decide where (e.g. class GeoObj, class Circle or class Line) this operator << should be defined. This operator allows outputs to standard display such as the console or to a file.

c) Define a driver to test the class Circle, Line, function template distance and operator << overloaded for both cout and file streams.

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