complex.cpp

《c＋＋大学教程实验指导书》源码

// Chapter 8 of C++ How to Program
// Programming Challenge 10

#include "complex.h"
#include <iostream> 

using std::ostream;
using std::istream;

// Constructor
Complex::Complex( double r, double i )
{
   real = r;
   imaginary = i;

} // end class Complex constructor

// Overloaded addition operator
Complex Complex::operator+( const Complex &operand2 ) const
{
   Complex sum;

   sum.real = real + operand2.real;
   sum.imaginary = imaginary + operand2.imaginary;
   return sum;

} // end function operator+

// Overloaded subtraction operator
Complex Complex::operator-( const Complex &operand2 ) const
{
   Complex diff;

   diff.real = real - operand2.real;
   diff.imaginary = imaginary - operand2.imaginary;
   return diff;

} // end function operator-

// Overloaded multiplication operator
Complex Complex::operator*( const Complex &operand2 ) const
{
   Complex times;

   times.real = real * operand2.real + imaginary * 
                operand2.imaginary;
   times.imaginary = real * operand2.imaginary + 
                     imaginary * operand2.real;
   return times;

} // end function operator*

// Overloaded = operator
Complex& Complex::operator=( const Complex &right )
{
   real = right.real;
   imaginary = right.imaginary;
   return *this;   // enables concatenation

} // end function operator=

// Overloaded == operator
bool Complex::operator==( const Complex &right ) const
{
   return right.real == real && right.imaginary == 
                     imaginary ? true : false;

} // end function operator==

// Overloaded != operator
bool Complex::operator!=( const Complex &right ) const
{ 
   return !( *this == right );

} // end function operator!=

// Overloaded << operator
ostream& operator<<( ostream &output, const Complex &complex )
{
   output << complex.real << " + " << complex.imaginary << 'i';
   return output;

} // end function operator<<

// Overloaded >> operator
istream& operator>>( istream &input, Complex &complex )
{
   input >> complex.real;
   input.ignore( 3 );       // skip spaces and +
   input >> complex.imaginary;
   input.ignore( 2 );

   return input;

} // end function operator>>


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