30parame_construct.cpp

#include<iostream>
#include<math.h>
using namespace std;

class point
{
    int a, b;
    public:
    point(int x, int y) //--> this is a parameterized constructor as it takes 2 parameters
    {
        a = x; 
        b = y;
    }
    void display()
    {
        cout<<"x coordinate : "<<a<<" y coordinate : "<<b<<endl;
    }
    friend float distance(point, point);
};

float distance(point p1, point p2)
{
    int xsec = (p1.a - p2.a)*(p1.a - p2.a);
    int ysec = (p1.b - p2.b)*(p1.b - p2.b);
    int segment = xsec + ysec;
    return sqrt(segment);
}
int main()
{
    //implicit constructor call
    point p1(2, 4);

    //explicit constructor call
    point p2 = point(5, 6);

    p1.display();
    p2.display();

    float distancep1p2 = distance(p1, p2);
    cout<<"Distance between point 1 and point 2 = "<<distancep1p2<<" units"<<endl;
    return 0;
}