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Hi so I have a practice lab I am working on where I am asked to fill in the code. The program is supposed to take in two 3D points (x,y,z) and compute the distance between them.

I have almosty all of the program finished im just stuck on how to call the inherited functions in main(). How do I pass my points (a,b,c) and (x,y,z) into the getDistance function? Would something like this work?:

```
cout << Obj3.getDistance(Obj2);
```

Here is my code:

```
// File name: ~ftp/pub/class/170/ftp/cpp/Inheritance/Exercise.cpp
// Purpose: Exercise for inheritance lab
#include <iostream>
#include <math.h> // for sqrt()
using namespace std;
class twoD
{
protected:
double x, y; // x and y coordinates
public:
// inline implementation of constructor
twoD(){x = y = 0.0;} // default constructor
twoD(double i, double j):x(i), y(j){}
// inline implementation of member functions
void setX(double NewX){x = NewX;}
void setY(double NewY){y = NewY;}
double getX() const {return x;}
double getY() const {return y;}
// get distance of 2D points
double getDistance (twoD point) const;
};
// calculate the distance of two 2D points
double twoD::getDistance(twoD point) const
{
double point1[2];
double point2[2];
double dx, dy;
double distance;
point1[0] = x;
point1[1] = y;
point2[0] = point.getX();
point2[1] = point.getY();
dx = point2[0] - point1[0];
dy = point2[1] - point1[1];
distance = sqrt(dx * dx + dy * dy);
return distance;
}
class threeD:public twoD
{
private:
double z;
public:
// --->ADD CODE HERE<---:
// Create a default inline constructor that reuses the constructor of
// the twoD class.
// YOUR CODE GOES HERE
threeD(double i, double j):twoD(i,j){z = 0.0;}
// --->ADD CODE HERE<---:
// Create an inline constructor that initializes the 3D point
// and reuses the twoD class.
// YOUR CODE GOES HERE
threeD(double i, double j, double k):twoD(i,j){z = k;}
void setZ(double NewZ){z = NewZ;}
double getZ() {return z;}
// get distance for two 3D points
double getDistance(threeD point) const;
};
// --->ADD CODE HERE<---:
// Overload the definition of getDistance() of twoD class so that it
// can calculate the distance between two 3D points
// YOUR CODE GOES HERE:
double threeD::getDistance(threeD point) const
{
double point1[3];
double point2[3];
double dx, dy, dz;
double distance;
point1[0] = x;
point1[1] = y;
point1[2] = z;
point2[0] = point.getX();
point2[1] = point.getY();
point2[2] = point.getZ();
dx = point2[0] - point1[0];
dy = point2[1] - point1[1];
dz = point2[2] - point1[2];
distance = sqrt(dx * dx + dy * dy + dz * dz);
return distance;
}
// --->ADD CODE HERE<---:
// Implement a main() function.
// You should ask the user for the xyz coordinates of two 3D points,
// and then calculate and print out the distance between these two points.
int main()
{
// YOUR CODE GOES HERE
double a,b,c;
double x,y,z;
cout << "Enter the x,y,z coordinates of point 1: " << endl;
cin >> a >> b >> c;
cout << "Point one is: (" << a << ", " << b << ", " << c << ")" << endl;
cout << endl;
cout << "Enter the x,y,z coordinates of point 2: " << endl;
cin >> x >> y >> z;
cout << "Point two is: (" << x << ", " << y << ", " << z << ")" << endl;
cout << endl;
threeD Obj3(x, y, z);
threeD Obj2(a, b, c);
return 0;
}
```