What's wrong with my code?

Hello, I have some code here and every time I compile in g++, I get these errors:


/tmp/ccCHleJp.o(.text+0x29): In function `main':
: undefined reference to `Point::Point[in-charge](int, int)'
/tmp/ccCHleJp.o(.text+0x44): In function `main':
: undefined reference to `Point::setPoint(int, int)'
/tmp/ccCHleJp.o(.text+0x4f): In function `main':
: undefined reference to `Point::getY()'
/tmp/ccCHleJp.o(.text+0x5c): In function `main':
: undefined reference to `Point::getX()'
/tmp/ccCHleJp.o(.text+0xcf): In function `main':
: undefined reference to `operator<<(std::basic_ostream<char, std::char_traits<char> >&, Point const&)'
collect2: ld returned 1 exit status

Point.h:
#include <iostream>

using namespace std;

class Point
{
        friend ostream &operator<<(ostream &, const Point &);

        public:
                Point(int = 0, int = 0);
                void setPoint(int, int);
                const int getX();
                const int getY();
        protected:
                int x, y;
};

Point.cpp:
#include <iostream>
#include "point.h"

using namespace std;

Point::Point(int a, int b)
{
        setPoint(a, b);
}

void Point::setPoint(int a, int b)
{
        x = a;
        y = b;
}

const int Point::getX()
{
        return x;
}

const int Point::getY()
{
        return y;
}

//output the point
ostream &operator<<(ostream &output, const Point &p)
{
        output << "[" << p.x << ", " << p.y << "]";
        return output;
}

main.cpp:

#include <iostream>

#include "point.h"

using namespace std;

int main()
{
        Point p(25,50);

        p.setPoint(25,25);

        cout << "X coordinate is " << p.getX() << "\nY coordinate is " << p.getY() << endl;

        cout << "\n\nThe new location of p is " << p << endl;

        return 0;
}

Thanks,
Igor