// Program to demonstrate the rectangular coordinate systems' Point.
// Assignment-20
// rectpnt.cpp, Author - Krishna Kumar Khatri.

// Uncomment ONLY the following line if you are using Turbo/Borland compiler.
// #define TC
#ifdef TC
	#include <iostream.h>
#else
	#include <iostream>
	using namespace std;
#endif
#include <conio.h>  // For getch.

class Point
{
        int x;
        int y;
    public:
        Point(const int& fp = 0, const int& sp = 0) : x(fp), y(sp)
            { }
        void add(const int&);
        void sub(const int&);
        //void angle();
        void display();
};

void Point::add(const int& inc)
    { x += inc; y += inc; }

void Point::sub(const int& dec)
    { x -= dec; y -= dec; }

void Point::display()
    { cout << "x=" << x << ", y=" << y; }

int main()
{
    #ifdef TC
        clrscr();
    #endif
    int a, b;
    int in = 3, de = 2;
    
    cout << "Enter co-ordinate points (x, y): ";
    cin >> a >> b;
    Point pt(a, b);

    cout << endl << "Original points, ";
    pt.display();
    
    pt.add(in);
    cout << endl << endl << "Incremented by " << in;
    cout << endl << "Modified point is, ";
    pt.display();
    
    pt.sub(de);
    cout << endl << endl << "Decremented by " << de;
    cout << endl << "Modified point is, ";
    pt.display();

    cout << endl << endl << "Program over. Press any key to exit...";
    getch();
    return 0; // Successful termination.
}