do (iii) and (iv) (i) This is a simple Point class interface file whose objects
ID: 3789203 • Letter: D
Question
do (iii) and (iv)
(i) This is a simple Point class interface file whose objects represent points in the cartesian plane
#include <iostream>
using namespace std;
class Point
{ public:
Point() // default constructor
Point(double x, double y); // another constructor
double x() const; // get function, return _x
double y() const; // get function, return _y
private:
double _x, _y;
};
(ii) Here is a test driver file for the Point class
#include "Point.h" // defines Point class
#include <iostream>
using namespace std;
int main()
{
Point p0; // invokes default constructor
Point p1(5,-2); // invokes constructor
Point p2 = p1;
p0 = p1; // invokes assignment operator
cout << "p0.x() = " << p0.x() << " ";
cout << "p0.y() = " << p0.y() << " ";
}
(iii) Write the implementation file of Point class
(iv) Add the following member functions to the point class, implement them, and test them in the driver
double magnitude() const; // returns polar coordinate r = (x^2 + y^2)^(1/2)
void move(double dx, double dy); // move the point dx in x direction and dy in y direction;
void print(ostream & out) const ; // print the point in the format (x, y) to ostream out
Explanation / Answer
// Point.h
#include <iostream>
using namespace std;
class Point
{ public:
Point(); // default constructor
Point(double x, double y); // another constructor
double x() const; // get function, return _x
double y() const; // get function, return _y
double magnitude() const; // returns polar coordinate r = (x^2 + y^2)^(1/2)
void move(double dx, double dy); // move the point dx in x direction and dy in y direction;
void print(ostream & out) const ; // print the point in the format (x, y) to ostream out
private:
double _x, _y;
};
// C++ implementation Point.cpp
#include <iostream>
#include <string>
#include <sstream>
#include <stdio.h>
#include <math.h>
#include "Point.h" // defines Point class
Point::Point() // default constructor
{
_x = 0;
_y = 0;
}
Point::Point(double x, double y) // another constructor
{
_x = x;
_y = y;
}
double Point::x() const
{
return _x;
}
double Point::y() const
{
return _y;
}
double Point::magnitude() const // returns polar coordinate r = (x^2 + y^2)^(1/2)
{
return sqrt(_x*_x + _y*_y);
}
void Point::move(double dx, double dy) // move the point dx in x direction and dy in y direction;
{
_x+=dx;
_y+=dy;
}
void Point::print(ostream & out) const // print the point in the format (x, y) to ostream out
{
out << "(" << _x << "," << _y << ")" << endl;
}
// C++ code main.cpp
#include <iostream>
#include <string>
#include <sstream>
#include <stdio.h>
#include "Point.h" // defines Point class
using namespace std;
int main()
{
Point p0; // invokes default constructor
Point p1(5,-2); // invokes constructor
Point p2 = p1;
p0 = p1; // invokes assignment operator
cout << "p0.x() = " << p0.x() << " ";
cout << "p0.y() = " << p0.y() << " ";
p0.print(cout);
}
/*
output:
p0.x() = 5
p0.y() = -2
(5,-2)
*/
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