atrctfun.cpp

#include <iostream>
#include <cmath>

struct polar
{
	double distance; 	// distance from origin
	double angle;		// direction from origin
};

struct rect
{
	double x;			// horizontal distance from origin
	double y;			// vertical distance from origin
};

// prototypes
polar rect_to_polar(rect xypos);
void show_polar(polar dapos);

int main()
{
	using namespace std;
	rect rplace;
	polar pplace;

	cout << "Enter the x and y values: ";
	while (cin >> rplace.x >> rplace.y) {
		pplace = rect_to_polar(rplace);
		show_polar(pplace);
		cout << "Next two numbers (q to quit): ";
	}
	cout << "Done.\n";
	return 0;
}

// convert rectangular to polar coordinates
polar rect_to_polar(rect xypos)
{
	using namespace std;
	polar answer;
	answer.distance = sqrt(xypos.x * xypos.x * xypos.y * xypos.y);
	answer.angle = atan2(xypos.y, xypos.x);
	return answer;
}

// show polar coordinates, converting angle to degrees
void show_polar(polar dapos)
{
	using namespace std;
	const double Rad_to_deg = 57.29577951;

	cout << "Distance = " << dapos.distance;
	cout << ", angle = " << dapos.angle * Rad_to_deg;
	cout << " degrees\n";
}