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[c++] Working with classes

November 16, 2006 Author: Chris T Posted in: Code Tutorials

 

This is a good tutorial working with classes in c++. Our program starts and asks the user to enter the coordinates of two points. The program returns the middle point and the distance between the two points.

#include <iostream>
#include <math.h>
using namespace std;
 
class Point
{
      private:
              double x,y;
      public:
             Point() { x=y=0;}
             Point(double a) {x=y=a;}
             Point(double a, double b) {x=a; y=b;}
             void Point::display() { cout <<"("<<x<<","<<y<<")"<<endl; }
             double Point::get_y() {return y;}
             double Point::get_x() {return x;}
};       
 
class Segment
{
      private:
              Point p1,p2,mid;
              double xm,ym,len, tmp1, tmp2;
      public:
             Segment(Point a) { Point p; p1=p; p2=a;}   
             Segment(Point a, Point b) { p1=a; p2=b;}
             void Segment::display()
             {    cout <<"The first point is: ";
                  p1.display();
                  cout <<"The second point is: ";
                  p2.display();
 
             }
             void Segment::middle()
             {
                  xm = (p2.get_x() + p1.get_x())/2;
                  ym = (p2.get_y() + p1.get_y())/2;
                  Point mid(xm,ym);
                  cout <<"To middle point is: ";
                  mid.display();
             }
             void Segment::length()
             {   
                tmp1 = (p2.get_x()-p1.get_x()) * (p2.get_x()-p1.get_x());
                //DEBUG cout <<tmp1<<endl;
                tmp2 = (p2.get_y()-p1.get_y()) * (p2.get_y()-p1.get_y());
                //DEBUG cout <<tmp2<<endl;
                len = sqrt(tmp1 + tmp2);
                cout <<"The distance between these two points is:"<<len<<endl;
             }     
};
 
int main ()
{
    double x1, y1, x2, y2;
 
    //Point p1;
    //p1.display();
    //Point p2(3);
    //p2.display();
    //Point p3(-1,8);
    //p3.display();
    //Point p4(3,6);
    //p4.display();
 
    cout <<"Enter x1:";
    cin >> x1;
    cout <<"Enter y1:";
    cin >> y1;
 
    cout <<"Enter x2:";
    cin >> x2;
    cout <<"Enter y2:";
    cin >> y2;
 
    Point p5(x1,y1);
    Point p6(x2,y2);;
 
    Segment s1(p5,p6);
    s1.display();
    s1.middle();
    s1.length();
 
    system("PAUSE");
    return 0;
}
 

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