直角坐标转极坐标

#include<iostream>
#include<cmath>
using namespace std;
struct rext		//直角坐标系
{
	double x;
	double y;
};
struct polar	//极坐标系
{
	double distance;
	double angle;
};
void rect_to_polar(const rext*pxy, polar *pda)
{
	pda->distance = sqrt(pxy->x * pxy->x + pxy->y * pxy->y);
	pda->angle = atan2(pxy->y, pxy->x);
}
void show_polar(const polar * pda)
{
	const double Red_to_deg = 57.29577951;
	cout << "distance = " << pda->distance << endl;
	cout << "angle = " << pda->angle*Red_to_deg << endl;
}
int main()
{
	rext rplace;
	polar pplace;
	cout << "Enter the x and y :";
	while (cin >> rplace.x >> rplace.y)
	{
		rect_to_polar( &rplace, &pplace);
		show_polar(&pplace);
		cin.get();
	}
	cin.get();
	return 0;
}