DDA in C++

gistfile1.cpp

#include <iostream>
#define ROUND(a) ((int)(a + 0.5))

using namespace std;

int drawDDA(int x1,int y1,int x2,int y2)
{
  float x = x1, y = y1;
	int len = (x2-x1)>(y2-y1)?(x2-x1):(y2-y1);
	float dx = (x2-x1)/(float)len;
	float dy = (y2-y1)/(float)len;
	cout<<"x = "<<ROUND(x)<<", y = "<<ROUND(y)<<"\n";
	for (int k=0; k < len; k++)
	{
		x += dx;
		y += dy;
		cout<<"x = "<<ROUND(x)<<", y = "<<ROUND(y)<<"\n";
	}
	return 0;
}

int main()
{
	drawDDA(2,5,10,20);
	return 0;

}