shiti8_5_1.cpp

为初学者提供的最佳的C++程序设计源程序库

class Imaginary
{
public:
	Imaginary(float a,float b);
	friend Imaginary Add(Imaginary& img1,Imaginary& img2);
	friend Imaginary Sub(Imaginary& img1,Imaginary& img2);
	friend Imaginary Mul(Imaginary& img1,Imaginary& img2);
	friend Imaginary Div(Imaginary& img1,Imaginary& img2);
private:
	float x,y;
};
Imaginary::Imaginary(float a,float b)
{
	x=a;
	y=b;
}
Imaginary Add(Imaginary& img1,Imaginary& img2)
{
	float a,b;
	a=img1.x+img2.x;
	b=img1.y+img2.y;
	return Imaginary(a,b);
}
Imaginary Sub(Imaginary& img1,Imaginary& img2)
{
	float a,b;
	a=img1.x-img2.x;
	b=img1.y-img2.y;
	return Imaginary(a,b);
}
Imaginary Mul(Imaginary& img1,Imaginary& img2)
{
	float a,b;
	a=img1.x*img2.x-img1.y*img2.y;
	b=img1.x*img1.y+img1.y*img2.x;
	return Imaginary(a,b);
}
Imaginary Div(Imaginary& img1,Imaginary& img2)
{
	float a,b;
	if((img2.x*img2.x+img2.y*img2.y)!=0)
	{
		a=(img1.x*img2.x+img1.y*img2.y)/(img2.x*img2.x+img2.y*img2.y);
		b=(img1.y*img2.x-img1.x*img2.y)/(img2.x*img2.x+img2.y*img2.y);
	    return Imaginary(a,b);
	}
	else
		return Imaginary(0.0,0.0);
}