The part I need help with is to fill in the lines of this code: complex.h #ifnde

Question

The part I need help with is to fill in the lines of this code:

complex.h
#ifndef COMPLEX_H
#define COMPLEX_H

#include <iostream>
using namespace std;

class Complex
{
// overloaded input and output operators
/* Write friend declarations for the stream insertion
and extraction operators */

public:
Complex( void ); // constructor
private:
/* Write declarations for data members real and imaginary */

}; // end class Complex

#endif

complex.cpp

#include <iostream>
#include <iomanip>
#include "Complex.h"
using namespace std;

// default constructor
Complex::Complex(void) :
real(0),
imaginary(0)
{
   // empty body
} // end Complex constructor

// overloaded output (<<) operator
ostream &operator<<(ostream &output, const Complex &c)
{

   output << c.real << showpos << c.imaginary << "i " << showpos;
   return output;// return ostream reference
} // end overloaded output (<<) operator

// overloaded input (>>) operator
istream &operator>>(istream &input, Complex &c)
{
   int number;
   int multiplier;
   char temp; // temporary variable used to store input

   input >> number; // get input

   // test if character is a space
   if ( /* Write a call to the peek member function to
       test if the next character is a space ' ' */) // case a + bi
   {
       c.real = number;
       input >> temp;

       multiplier = (temp == '+') ? 1 : -1;

       // set failbit if character not a space
       if (input.peek() != ' ')
           /* Write a call to the clear member function with
           ios::failbit as the argument to set input's fail bit */
       else
       {
           // set imaginary part if data is valid
           if (input.peek() == ' ')
           {
               input >> c.imaginary;
               c.imaginary *= multiplier;
               input >> temp;
               if ( /* Write a call to member function peek to test if the next
                   character is not a newline */) // character not a newline
                   input.clear(ios::failbit); // set bad bit
           } // end if
           else
               input.clear(ios::failbit); // set bad bit
       } // end else
   } // end if
   else if ( /* Write a call to member function peek to test if
           the next character is 'i' */) // test for i of imaginary number
   {
       input >> temp;

       // test for newline character entered
       if (input.peek() == ' ')
       {
           c.real = 0;
           c.imaginary = number;
       } // end if
       else
           input.clear(ios::failbit); // set bad bit
   } // end else if
   else if (input.peek() == ' ') // set real number if it is valid
   {
       c.real = number;
       c.imaginary = 0;
   } // end else if
   else
       input.clear(ios::failbit); // set bad bit
   return input;
} // end overloaded input (>>) operator

Write a program that accomplishes each of the following: Create a user-defined class complex that contains the private integer data members real and imaginary and declares stream insertion and stream extraction overloaded operator functions as friends of the class.

Explanation / Answer

// Complex.h
#ifndef COMPLEX_H
#define COMPLEX_H

#include <iostream>
using std:stream;
using std::istream;

class Complex
{
friend ostream &operator<<(ostream &output, const Complex &c);
friend istream &operator>>(istream &input, Complex &c);
public:
Complex(void);
private:
   int real;
   int imaginary;
};

// Complex.cpp

#include <iostream>
#include <iomanip>
using std::ios;
using std::istream;
using std:stream;
using std::showpos;

#include "Complex.h"

Complex::Complex(void):
real(0),
imaginary(0)
{
}

ostream &operator<<(ostream &output, const Complex &c)
{
output << c.real << showpos << c.imaginary << "i " << showpos;
return output;
}

istream &operator>>(istream &input, Complex &c)
{
int number;
int multiplier;
char temp;

input >> number;

if (input.peek() == ' ')
{
c.real = number;
input >> temp;

multiplier = ( temp == '+' ) ? 1 : -1;

if (input.peek() != ' ')

input.clear( ios::failbit );
else
{
if (input.peek() == ' ')
{
input >> c.imaginary;
c.imaginary *= multiplier;
input >> temp;

if ( input.peek() == ' ' )
input.clear(ios::failbit);
}
else
input.clear(ios::failbit);
}
}
else if (input.peek() == 'i')
{
input >> temp;

if (input.peek() == ' ')
{
c.real = 0;
c.imaginary = number;
}
else
input.clear(ios::failbit );
}
else if (input.peek() == ' ')
{
c.real = number;
c.imaginary = 0;
}
else
input.clear(ios::failbit);
return input;
}

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