Question

Hello, I'm looking to modify my fraction program to include constructors and destructors. Here are all the instructions:

• Create constructors
  • default
  • two argument
  • three argument
  • copy constructor
• Create a destructor. The destructor should set whole and numerator to zero and denominator to one.
• Add cout statements to the constructors and the destructor so you know when it's getting executed. Add system ("pause") to the destructor so you know when it executes.
• Only positive values allowed
• If denominator is 0 set it to 1 and output an appropriate message

And this is the code i have so far:

#include <iostream>

using namespace std;

class Fractions {
private:
   int numerator;
   int denominator;

public:
   void NumeratorDenominator(int n, int d);

   int getNumerator() const{
       return numerator;
   }

   int getDenominator()const {
       return denominator;
   }

   void print()const;
      
};

int main() {
   Fractions f1;
   Fractions f2;

   cout << " Testing 9/0" << endl;
   f1.NumeratorDenominator(9, 0);
   f1.print();
   cout << "Testing 9/2" << endl;
   f2.NumeratorDenominator(9, 2);
   f2.print();
   cout << " Testing -9/4" << endl;
   f1.NumeratorDenominator(-9, 4);
   f1.print();
   cout << " Testing 10/2" << endl;
   f1.NumeratorDenominator(10, 2);
   f1.print();
   cout << " Testing 3/4" << endl;
   f1.NumeratorDenominator(3, 4);
   f1.print();

   system("pause");
}

void Fractions::NumeratorDenominator(int n, int d) {

   if (d <= 0 || n < 0) {
       numerator = 0;
       denominator = 1;
   }
   else {
       numerator = n;
       denominator = d;
   }
}

void Fractions:: print()const {
   if (numerator<denominator)
       cout << numerator<< "/" << denominator << endl;
   else {
       cout << numerator / denominator << " " << numerator % denominator << "/" << denominator << endl;
   }
}

Answer 1

Please find the answer below::::

main.cpp

#include <iostream>

using namespace std;

class Fractions {
private:
   int numerator;
   int denominator;

public:

   //default constructor
   Fractions(){
       cout<<"Calling default constructor"<<endl;
       numerator = 0;
       denominator = 1;
   }

   Fractions(int whole,int num,int den){
       num = whole*den + num;
       cout<<"Calling parametrized constructor"<<endl;
       if(num>=0){
           numerator = num;
       }else{
           cout<<"Numerator is less than zero!!! Setting it to zero";
       }
       if(den==0){
           cout<<"Denominator is zero !! Setting it to 1"<<endl;
           den = 1;
       }else if(den<0){
           cout<<"Denominator is less than zero!!! Setting it to 1";
           denominator = 1;
       }else{
           denominator = den;
       }

   }

   Fractions(int num,int den){
       cout<<"Calling parametrized constructor"<<endl;
       if(num>=0){
           numerator = num;
       }else{
           cout<<"Numerator is less than zero!!! Setting it to zero";
       }
       if(den==0){
           cout<<"Denominator is zero !! Setting it to 1"<<endl;
           den = 1;
       }else if(den<0){
           cout<<"Denominator is less than zero!!! Setting it to 1";
           denominator = 1;
       }else{
           denominator = den;
       }

   }

   Fractions(const Fractions & copyMe){
       numerator = copyMe.numerator;
       denominator = copyMe.denominator;
   }

   ~Fractions(){
       cout<<"Calling destructor"<<endl;
       denominator = 1;
       numerator = 0;
   }

   void NumeratorDenominator(int n, int d);

   int getNumerator() const{
       return numerator;
   }

   int getDenominator()const {
       return denominator;
   }

   void print()const;

};

int main() {
   Fractions f1;
   Fractions f2;

   cout << " Testing 9/0" << endl;
   f1.NumeratorDenominator(9, 0);
   f1.print();
   cout << "Testing 9/2" << endl;
   f2.NumeratorDenominator(9, 2);
   f2.print();
   cout << " Testing -9/4" << endl;
   f1.NumeratorDenominator(-9, 4);
   f1.print();
   cout << " Testing 10/2" << endl;
   f1.NumeratorDenominator(10, 2);
   f1.print();
   cout << " Testing 3/4" << endl;
   f1.NumeratorDenominator(3, 4);
   f1.print();

   Fractions f3(4,5,6);
   cout << " Fractions f3(4,5,6)" << endl;
   f3.print();

   Fractions f4;
   cout << " Fractions f4" << endl;
   f4.print();

   Fractions f5(12,5);
   cout << " Fractions f5(12,5)" << endl;
   f5.print();
   system("pause");
}

void Fractions::NumeratorDenominator(int n, int d) {
   if (d <= 0 || n < 0) {
       numerator = 0;
       denominator = 1;
   }
   else {
       numerator = n;
       denominator = d;
   }
}

void Fractions:: print()const {
   if (numerator<denominator)
       cout << numerator<< "/" << denominator << endl;
   else {
       cout << numerator / denominator << " " << numerator % denominator << "/" << denominator << endl;
   }
}

output: