Question

afe Rational Fractions

In week 4 we completed Chapter 13 Programming Exercise #10 Page 974. Make sure you have a working fractionType class before starting this assignment. The template requirement from week 4 is not required for this assignment.

Your assignment this week is to make your fractionType class safe by using exception handling.

Use exceptions so that your program handles the exceptions division by zero and invalid input.

• An example of invalid input would be entering a fraction such as 7 / 0 or 6 / a
• An example of division by zero would be: 1 / 2 / 0 / 3

        

Use a custom Exception class called fractionException. The class must inherit from exception (see example in lecture and note the entire class can be implemented in the .h file as in the lecture).

Test your safe fractionType class with a main method that forces an invalid fraction and a divide by zero. The catch block in the main method must report which kind of error was encountered – i.e. invalid fraction or divide by zero.

The following can be used to test an exception:

try {

fractionType<int> num1(1,0);

fractionType<int> num2(0,3);

fractionType<int> num3;

cout << fixed;

cout << showpoint;

cout << setprecision(2);

num3 = num1 / num2;

        

cout << num1 << " / " << num2 << " = " << num3 << endl;

}

catch (fractionException e) {

cout << "Exception caight in main: " << e.what() << endl;

}

Submission Guidelines:

Submit modified fractionType class (.h and .cpp file if exists)

Submit fractionException class (.h file and .cpp file if exists)

Submit main test .cpp program to test the exception handling

Answer 1

/*fraction.h*/

#ifndef FRACTION_H
#define FRACTION_H

#include<iostream>
#include<exception>

using namespace std;

/*Exception class derived from std::exception*/
class fractionException : public exception
{
   private:
       const char *msg;
   public:
       fractionException(const char *m) : msg(m){}
       virtual const char *what() const throw()
       {
           return msg;
       }
};

//fractionType class definition
class fractionType
{
   private:
       int n, d;
      
   public:
       fractionType() : n(0), d(1){}
       fractionType(int num, int den) : n(num), d(den)
       {
           if(den == 0)
               throw fractionException("Division by zero");//Throw division by zero exception
       }
      
       fractionType operator/(const fractionType &x);
       friend ostream& operator<<(ostream &out, const fractionType &f);
       friend istream& operator>>(istream &in, fractionType &f);
};

#endif

/*End of franction.h*/

/*fraction.cpp*/

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

using namespace std;

//Function to perform division
fractionType fractionType::operator/(const fractionType &x)
{
   if(x.n == 0)
       throw fractionException("Division by zero");//Throw division by zero exception
   fractionType f;
   f.n = this->n*x.d;
   f.d = this->d*x.n;
   return f;
}

//Overloaded << operator
ostream& operator<<(ostream &out, const fractionType &f)
{
   out<<f.n<<"/"<<f.d;
   return out;
}

//Overloaded >> operator
istream& operator>>(istream &in, fractionType &f)
{
   in>>f.n;
   if(in.fail())
       throw(fractionException("Invalid Input"));//Throw invalid input exception
   in.ignore(1);
   in>>f.d;
   if(in.fail())
       throw(fractionException("Invalid Input"));//Throw invalid input exception
   if(f.d == 0)
       throw fractionException("Division by zero");//Throw division by zero exception  
   return in;
}

/*end of fraction.cpp*/

/*main.cpp*/

#include<iostream>
#include<iomanip>
#include "fraction.h"

using namespace std;

int main()
{
   try
   {
       fractionType num1(1,2);
       fractionType num2(0,3);
       fractionType num3;
       cout << fixed;
       cout << showpoint;
       cout << setprecision(2);
       num3 = num1 / num2;
       cout << num1 << " / " << num2 << " = " << num3 << endl;
   }
   catch (fractionException e)
   {
       cout << "Exception caught in main: " << e.what() << endl;
   }
   return 0;
}

/*End of main.cpp*/

SAMPLE OUTPUT:





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