Line (Shajed)

#include <bits/stdc++.h>
using namespace std;

class Line
{
    double x1, y1, x2, y2;
public:
    Line()
    {}
    Line(double _x1, double _y1, double _x2, double _y2)
    {
        x1 = _x1, y1 = _y1, x2 = _x2, y2 = _y2;
    }
    double getSlope()
    {
        double sl;
        sl = (y2 - y1) / (x2 - x1);
        if((x2 - x1) == 0)
            cout<<"The line is parallel to Y.";
        return sl;
    }
    double getInsectofYaxis()
    {
        double m, i, j, k, n;
        m = getSlope();
        i = m * (-1 * x1);
        i += y1;
        return i;
    }
    bool CheckColinear(double x, double y)
    {
        double m, i, j, k, n;
        m = getSlope();
        i = y - y1;
        j = x - x1;
        k = m * j;
        if(i == k)
            return true;
        return false;
    }
};

int main()
{
    Line line1(2, 3, 6, 4);
    cout<<line1.getSlope()<<endl;
    cout<<line1.getInsectofYaxis()<<endl;
    bool ck = line1.CheckColinear(4, 3.5);
    if(ck == false)
        cout<<"The point doesn't exists on the line.\n";
    else
        cout<<"The point exists on the line!!\n";
    return 0;
}