c4_complex_lib.cpp

# include <cstdlib>
# include <iostream>
# include <cmath>

using namespace std;

# include "c4_complex_lib.hpp"

/********************************************************
 * c = c / c -- c4_complex division			*
 *							*
 * Parameters						*
 *	oper1, oper2 -- two operands of the divide	*
 *							*
 * Returns						*
 *	result of the divide				*
 ********************************************************/
c4_complex operator / ( const c4_complex &oper1, const c4_complex &oper2 )
{
  // Denominator of the result
  float den = fabs(oper2.real()) + fabs(oper2.imaginary());

  // Real part of the oper1 factor
  float oper1_real_den = oper1.real() / den;
  // Imaginary part of the oper1 factor
  float oper1_imag_den = oper1.imaginary() / den;

  // Real part of the oper2 factor
  float oper2_real_den = oper2.real() / den;
  // Imaginary part of the oper2 factor
  float oper2_imag_den = oper2.imaginary() / den;

  // Normalization factor
  float normalization   = oper2_real_den * oper2_real_den + 
			   oper2_imag_den * oper2_imag_den;

  return c4_complex((oper1_real_den * oper2_real_den + 
		  oper1_imag_den * oper2_imag_den) / normalization,
                 (oper1_imag_den * oper2_real_den - 
		  oper1_real_den * oper2_imag_den) / normalization);
}

/********************************************************
 *  c /= c -- c4_complex divide by				*
 *							*
 * Parameters						*
 *	oper2 -- operator to divide by			*
 *							*
 * Returns						*
 * 	Reference to the result of the divide		*
 ********************************************************/
c4_complex& c4_complex::operator /= (const c4_complex& oper2)
{
  // Denominator of the result
  float den = fabs(oper2.real()) + fabs(oper2.imaginary());

  // Denominator -- operator 1 real part
  float oper1_real_den = real_part / den;

  // Denominator -- operator 1 imaginary part
  float oper1_imag_den = imaginary_part / den;

  // Denominator -- operator 2 real part
  float oper2_real_den = oper2.real() / den;

  // Denominator -- operator 2 imaginary part
  float oper2_imag_den = oper2.imaginary() / den;

  // Normalization factor
  float normalization = oper2_real_den * oper2_real_den + 
			 oper2_imag_den * oper2_imag_den;
  real_part      = (oper1_real_den * oper2_real_den + 
		    oper1_imag_den * oper2_imag_den) / normalization;
  imaginary_part = (oper1_imag_den * oper2_real_den - 
		    oper1_real_den * oper2_imag_den) / normalization;
  return (*this);
}

/********************************************************
 * istream >> c4_complex -- read a c4_complex *
 *							*
 * Parameters						*
 *	in_file -- file to read				*
 *	number -- place to put the number		*
 *							*
 * Returns						*
 *	reference to the input file			*
 ********************************************************/
istream &operator >> ( istream &in_file, c4_complex &number )
{
    float real, imaginary;  // Real and imaginary part.
    char ch;		// Random character used to verify input

    number.set ( 0.0, 0.0 );	// Initialize the number (just in case)
//
//  ERROR: NO MATCHING FUNCTION FOR CALL TO IPFX...
//
//   in_file.ipfx(1);	// Tell the i/o system we are reading formatted
    in_file >> ws;	// Skip whitespace

    if (in_file.bad()) 
    {
      return (in_file);	
    }

    in_file >> ch;	// Get character after whitespace
    if (ch != '(')
    {
//        in_file.setf ( ios::failbit );	// We have an error
	return (in_file);
    }

    in_file >> real;

    if (in_file.bad()) 
    {
      return (in_file);
    }

    in_file >> ws >> ch;	// Get first character after number

    if (in_file.bad())
    { 
      return (in_file);
    }
    if (ch != ',')
    {
//       in_file.setf(ios::failbit);
       return (in_file);
    }

    in_file >> imaginary;

    in_file >> ws >> ch;
    if (in_file.bad()) 
    {
      return (in_file);
    }
    if (ch != ')') 
    {
//      in_file.setf(ios::failbit);
       return (in_file);
    }
    number.set(real, imaginary);
    return (in_file);
}