Question

Do the following:

1) Add a constructor with two parameters, one for the numerator, one for the denominator. If the parameter for the denominator is 0, set the denominator to 1

2) Add a function that overloads the < operator

3) Add a function that overloads the * operator

4) Modify the operator<< function so that if the numerator is equal to the denominator it just prints 1

5) Modify the operator>> function so that after it reads the denominator it sets it to 1 if it is 0

6) Modify the main program so that it tests the 3 functions you created and the 2 functions you modified

7) Add comments to the 3 files

//main.cpp

#include "Fraction.h"

int main ()

{

Fraction f1,f2,f3;

cout<< "Enter a fraction in the form a/b ";

cin >> f1;

cout<< "Enter another fraction in the form a/b ";

cin >> f2;

if ( f1 == f2 )

cout << "\nThe two fractions are equal\n";

else cout <<"\nThe two fractions are different\n";

f3 = f1 + f2;

cout << f1 << " + " << f2 << " = " << f3;

return 0;

}

//Fraction.cpp

#include "Fraction.h"

Fraction :: Fraction()

{

numerator = 0;

denominator = 1;

}

ostream& operator<< ( ostream& ofile, const Fraction &f )

{

ofile<< f.numerator;

ofile<< " / ";

ofile<<f.denominator;

return ofile;

}

istream& operator>> ( istream &ifile, Fraction &f )

{

char ch;

ifile>> f.numerator;

ifile>> ch; // read and discard the symbol /

ifile>> f.denominator;

return ifile;

}

Fraction Fraction :: operator+ ( const Fraction &other)

{

Fraction temp;

temp.numerator = numerator*other.denominator +

denominator*other.numerator;

temp.denominator = denominator * other.denominator;

//C++

return temp;

}

bool Fraction :: operator== ( const Fraction &other )

{

return ( numerator*other.denominator ==

denominator*other.numerator);

}

//Fraction.h

#include <iostream>

using namespace std;

#ifndef FRACTION_H

#define FRACTION_H

class Fraction

{

friend ostream& operator<< (ostream&, const Fraction& );

friend istream& operator>> (istream &, Fraction &);

private:

int numerator;

int denominator;

public:

Fraction();

Fraction operator+ ( const Fraction& );

bool operator== ( const Fraction& );

};

#endif

Answer 1

Code:

//Fraction.h

//Fraction.h

#include <iostream>

using namespace std;

#ifndef FRACTION_H

#define FRACTION_H

class Fraction

{

friend ostream& operator<< (ostream&, const Fraction& );

friend istream& operator>> (istream &, Fraction &);

private:

int numerator;

int denominator;

public:

//Add a constructor with two parameters, one for the numerator, one for the denominator. If the parameter for the denominator is 0, set the denominator to 1

Fraction(int n=0,int d=1);

Fraction operator+ ( const Fraction& );

//2) Add a function that overloads the < operator

//3) Add a function that overloads the * operator

bool operator< ( const Fraction& );

Fraction operator* ( const Fraction& );

bool operator== ( const Fraction& );

};

#endif

//Fraction.cpp

//Fraction.cpp

#include "Fraction.h"

Fraction :: Fraction(int n,int d)

{

numerator = n;

if(d==0){

denominator = 1;

}else{

denominator = d;

}

}

ostream& operator<< ( ostream& ofile, const Fraction &f )

{

// if the numerator is equal to the denominator it just prints 1

if(f.numerator==f.denominator){

ofile<< 1;

return ofile;

}

ofile<< f.numerator;

ofile<< " / ";

ofile<<f.denominator;

return ofile;

}

istream& operator>> ( istream &ifile, Fraction &f )

{

char ch;

ifile>> f.numerator;

ifile>> ch; // read and discard the symbol /

ifile>> f.denominator;

// after it reads the denominator it sets it to 1 if it is 0

if (f.denominator==0){

f.denominator=1;

}

return ifile;

}

Fraction Fraction :: operator+ ( const Fraction &other)

{

Fraction temp;

temp.numerator = numerator*other.denominator +

denominator*other.numerator;

temp.denominator = denominator * other.denominator;

return temp;

}

Fraction Fraction :: operator* ( const Fraction &other)

{

Fraction temp;

temp.numerator = numerator*other.numerator;

temp.denominator = denominator * other.denominator;

return temp;

}

bool Fraction :: operator< ( const Fraction &other )

{

if(denominator != other.denominator){

int a=numerator*other.denominator;

int b=other.numerator*denominator;

if (a<b){

return true;

}else{

return false;

}

}

return numerator<other.numerator;

}

bool Fraction :: operator== ( const Fraction &other )

{

return ( numerator*other.denominator == denominator*other.numerator);

}

//main.cpp

#include "Fraction.h"

using namespace std;

int main ()

{

Fraction f1,f2,f3;

cout<< "Enter a fraction in the form a/b ";

cin >> f1;

cout<< "Enter another fraction in the form a/b ";

cin >> f2;

if ( f1 == f2 ){

cout << "\nThe two fractions are equal\n";

}

else {cout <<"\nThe two fractions are different\n";

}

f3 = f1 + f2;

cout << f1 << " + " << f2 << " = " << f3 <<endl;

//Modify the main program so that it tests the 3 functions you created and the 2 functions you modified

//testing the constructor

Fraction f4(5,5);

//testing the modified <<

cout<<"f4 = "<<f4<<endl;

//testing the constructor

Fraction f5;

//testing the modified >>

cout<< "Enter a fraction in the form a/b ";

cin>>f5;

cout<<f5<<endl;

Fraction f6(1,2);

Fraction f7(4,6);

if(f6<f7){

cout<<f6 <<" is less than "<< f7<<endl;

}

else{

cout<<f6 <<" is not less than "<< f7<<endl;

}

return 0;

}