头文件管理C++

#ifndef COORDIN_H_
#define COORDIN_H_
struct polar
{
double distance;
double angle;
};

struct rect
{
double x;
double y;
};

polar rect_to_polar(rect xypos);
void show_polar(polar dapos);
#endif

#include "stdafx.h"
#include "iostream"
#include "cmath"
#include "coordin.h"
using namespace std;
polar rect_to_polar(rect xypos)
{
polar name;
name.distance=sqrt(xypos.x*xypos.x+xypos.y*xypos.y);
name.angle=atan2(xypos.y,xypos.x);
return name;
}
void show_polar(polar dapos)
{
	const double i=57.353446;
	cout<<dapos.distance<<endl;
	cout<<dapos.angle*i<<"degrees\n"<<endl;
}

// stl4.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include "coordin.h"
#include "iostream"
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
rect rplace ;
polar pplace;
while(cin>>rplace.x>>rplace.y)
{
pplace=rect_to_polar(rplace);
show_polar(pplace);
}
	return 0;
}