Problem with passing class to a function

[nightbreed]

Hey guys!
I'm new to C++ and I'm trying to solve a simple problem - calculate the distance between two points in a plane with known coordinates.

Here is the source.

#include <iostream>
#include <vector>
#include <cmath>

using namespace std;

typedef class
{
private:
	int x;
	int y;
public:
	void get_coords(int a, int b) 
	{
		x = a;
		y = b;
	};
	int get_x() 
	{
		return x;
	}
	int get_y()
	{
		return y;
	}
}X;

float distance(X Point1, X Point2);
int sqr(int n);

int main ()
{
    X A, H;

	A.get_coords(0, 0);
	H.get_coords(0, 4);
	
	cout << distance(A, H);

        return 0;	
}

float distance(X Point1, X Point2) 
{
	return sqrt(sqr(abs(Point1.get_x() - Point2.get_x())) + sqr(abs(Point1.get_y() - Point2.get_y())));
}

int sqr(int n) 
{
    return n*n;
}

The problem is that I can't pass the 2 points to the distance(...) function. Any help will be appreciated.

[kbw]

You shouldn't use the form:

typedef class
{
} X;

It comes from C, but isn't correct in C++. You should use:

class X
{
};

sqrt seems to be overloaded for long double, double and float, not for int. So you need to convert your int coordinates to one of these floating point types.

[nightbreed]

Same thing. Dev C++ returns these errors :

In instantiation of `std::iterator_traits<X>':
instantiated from here
no type named `iterator_category' in `class X'
no type named `value_type' in `class X'
no type named `difference_type' in `class X'
no type named `pointer' in `class X'
no type named `reference' in `class X'

[kbw]

It might be helpful if you called your class Point rather than X.

Anyway, you need to make a change like:

float distance(X Point1, X Point2) 
{
	float dx = Point1.get_x() - Point2.get_x();
	float dy = Point1.get_y() - Point2.get_y();

	return sqrt(dx*dx + dy*dy);
}

Oh, distance is an STL function. There's a clash because you've used:

using namespace std;

Call it something else.

[nightbreed]

The compiler returns the same errors. Is there a possibility that the compiler is the problem ?

Edit: Renamed the distance() function. It works now :). Thanks alot!