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enum day = {Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday};
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enum city = {Sapporo, Sendai, Tokyo, Yokohama, Nagoya, Kyoto, Osaka, Kobe, Hiroshima, Kitakyushu, Fukuoka};

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struct vector2 { float x; float y}; 
  struct vector2 p1,p2;
  float  distance;

  p1.x = 1.0; p1.y = 1.0;
  p2.x = 2.0; p2.y = 3.0;
  distance = sqrt(pow(p2.x-p1.x, 2.)+pow(p2.y-p1.y, 2.));
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/usr/include/time.h 
struct	tm {
	int	tm_sec;
	int	tm_min;
	int	tm_hour;
	int	tm_mday;
	int	tm_mon;
	int	tm_year;
	int	tm_wday;
	int	tm_yday;
	int	tm_isdst;
	char	*tm_zone;
	long	tm_gmtoff;
};

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��FC++ �ɂ����� complex.h 
class complex {
	double	re, im;
public:
	complex()	{ re=0.0; im=0.0; }
	complex(double r, double i = 0.0)	{ re=r; im=i; }
	 	
	friend	double	real(const complex&);
	friend	double	imag(const complex&);

	friend	double	abs(complex);
	friend  double  norm(complex);
	friend  double	arg(complex);
	friend  complex conj(complex);
	friend  complex cos(complex);
	friend  complex cosh(complex);
	friend	complex exp(complex);
	friend  complex log(complex);
	friend  complex pow(double, complex);
	friend	complex pow(complex, int);
	friend	complex pow(complex, double);
	friend	complex pow(complex, complex);
	friend  complex	polar(double, double = 0);
	friend  complex sin(complex);
	friend  complex sinh(complex);
	friend	complex sqrt(complex);

	friend	complex	operator+(complex, complex);
	friend	complex	operator-(complex);
	friend	complex operator-(complex, complex);
	friend	complex operator*(complex, complex);
	friend 	complex operator/(complex, complex);
	friend 	int	operator==(complex, complex);
	friend 	int	operator!=(complex, complex);
	
	void operator+=(complex);
	void operator-=(complex);
	void operator*=(complex);
	void operator/=(complex);
};
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