How to fix error Undefined symbols for architecture x86_64 - macos

Question

I am trying to code a very simple class in C++11 but I am getting the compiler error 'Undefined symbols for architecture x86_64'. What does it mean? How do I deal with it?
I am using Visual Studio Code for MacOS and the compiler Clang-8 (updated 2 days ago).
Here are the 3 files I have written so far:
*------------------------------------------------------------------*/
class Point
{
// Type declaration statements for data members
private:
double xCoord, yCoord; // Class atributes
public:
// Declaration statements for class methods
// Constructors for Point class
Point(); // Default constructor
Point(double x, double y); // Parameterized constructor
};
/*------------------------------------------------------------------*/
/*------------------------------------------------------------------*/
#include "Point.h" // Required
#include<iostream> // Required for cout
using namespace std;
// Default constructor
Point::Point()
{
cout << "Constructing point object, default: \n";
cout << "Initializing to zero" << endl;
xCoord = 0.0;
yCoord = 0.0;
}
// Parameterized constructor
Point::Point(double x, double y)
{
// Input paraneters x and y
cout << "Constructing point object, parameterized: \n";
cout << "Input parameters: " << x << "," << y << endl;
xCoord = x;
yCoord = y;
}
/*------------------------------------------------------------------*/
/*------------------------------------------------------------------*/
#include<iostream>
#include "Point.h"
using namespace std;
int main()
{
// Declare and initialize objects
cout << "In main, declare p1... " << endl;
Point p1;
cout << "\nIn main, declare p2... " << endl;
Point p2{1.5, -4.7};
return 0;
}
/*------------------------------------------------------------------*/
The full error message is:
Undefined symbols for architecture x86_64:
"Point::Point(double, double)", referenced from:
_main in cpp14test-15cf25.o
"Point::Point()", referenced from:
_main in cpp14test-15cf25.o
ld: symbol(s) not found for architecture x86_64
clang-8: error: linker command failed with exit code 1 (use -v to see invocation)
The terminal process terminated with exit code: 1