11.2.cpp

这是C++的一部分练习程序!对初学者有一定的帮助作用。

#include <iostream.h>
class Complex
{
  public:
	Complex()
	{  real=imag=0;  }
	Complex(double r)
	{  real=r;imag=0;  }
	Complex(double r,double i)
	{  real=r;imag=i;  }
	friend Complex operator +(const Complex &c1,const Complex &c2);
	friend Complex operator -(const Complex &c1,const Complex &c2);
	friend Complex operator *(const Complex &c1,const Complex &c2);
	friend Complex operator /(const Complex &c1,const Complex &c2);
	friend void Print(const Complex &c);
  private:
	double real,imag;
};
Complex operator +(const Complex &c1,const Complex &c2)
{
	return Complex(c1.real+c2.real,c1.imag+c2.imag);
}
Complex operator -(const Complex &c1,const Complex &c2)
{
	return Complex(c1.real-c2.real,c1.imag-c2.imag);
}
Complex operator *(const Complex &c1,const Complex &c2)
{
	return Complex(c1.real*c2.real-c1.imag*c2.imag,c1.real*c2.imag+c1.imag*c2.real);
}
Complex operator /(const Complex &c1,const Complex &c2)
{
	return Complex((c1.real*c2.real+c1.imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag),
		(c1.imag*c2.real-c1.real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag));
}
void Print(const Complex &c)
{
	if(c.imag<0)
		cout<<c.real<<c.imag<<'i'<<endl;
	else
		cout<<c.real<<'+'<<c.imag<<'i'<<endl;
}
void main()
{
	Complex c1(2.5),c2(5.5,-1.0),c3;
	c3=c1+c2;
	cout<<"c1+c2=";
	Print(c3);
	c3=c1-c2;
	cout<<"c1-c2=";
	Print(c3);
	c3=c1*c2;
	cout<<"c1*c2=";
	Print(c3);
	c3=c1/c2;
	cout<<"c1/c2=";
	Print(c3);
}