Question

When running the program at the destructor  an exception is being thrown. Can someone help me out?

vararray.h:

#ifndef VARARRAY_H_
#define VARARRAY_H_

class varArray {
public:
   varArray(); // void constructor
   int arraySize() const { return size; } // returns the size of the array

   int check(double number); // returns index of element containg "number" or -1 if none
   void addNumber(double); // adds number to the array
   void removeNumber(double); // deletes the number from the array
   void output(); // prints the values of the array

   // big three
   varArray(const varArray&); // copy constructor
   varArray& operator=(const varArray&); // overloaded assignment
   ~varArray(); // destructor

private:
   double *dArray; // pointer to the dynamically allocated array
   int size; // array size
};

#endif /* VARARRAY_H_ */

VarArray.cpp:

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

using std::cin; using std::cout; using std::endl;

varArray::varArray() {
   dArray = new double[0];
   size = 0;
}

int varArray::check(double number) {
   int index = -1;
   for (int i = 0; i < size; ++i) {
       if (dArray[i] == number) {
           index = i;
           break;
       }
   }
   return index;
}

void varArray::addNumber(double number) {
   int tmp = -1;
   for (int i = 0; i <= size; i++) {
       if (number == dArray[i])
           return;
       else
           tmp = 1;
   }
   if (tmp == 1) {
       double *temp = new double[size + 1];
       for (int i = 0; i < size; i++) {
           temp[i] = dArray[i];
       }
       temp[size] = number;
       delete[] dArray;
       dArray = temp;
       ++size;
   }
}

void varArray::removeNumber(double number) {
   bool found = false;
   int tmp;
   for (int i = 0; i < size; i++) {
       if (dArray[i] == number) {
           found = true;
           tmp = i;
       }
   }

   if (found == true) {
       --size;
       double *temp2 = new double[size];
       for (int i = 0; i <= size; i++) {
           if (dArray[i] != number) {
               if (i >= number)
                   temp2[i - 1] = dArray[i];
               else
                   temp2[i] = dArray[i];
           }
       }
       delete[]dArray;
       dArray = temp2;
   }
}

void varArray::output() {
   cout << endl;
   for (int i = 0; i < size; ++i) {
       cout << dArray[i] << " ";
   }
   cout << endl;
}

varArray::varArray(const varArray& org) {
   size = org.size;
   dArray = new double[size];
   for (int i = 0; i < size; i++)
       dArray[i] = org.dArray[i];
}

varArray::~varArray() {
   delete[] dArray; size = 0;
}

varArray& varArray::operator=(const varArray& tmp) {
   if (this == &tmp)
       return *this;
   size = tmp.size;
   delete[] dArray;
   dArray = new double[size];
   for (int i = 0; i < size; ++i) {
       dArray[i] = tmp.dArray[i];
   }
   return *this;
}

VarMain.cpp:

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

using std::cout; using std::endl; using std::cin;

int main()
{
   double i, k, n;
   varArray object;

   cout << "Enter the size of array : ";
   cin >> n;
   cout << "Enter the array elements : ";
   for (i = 0; i < n; i++)
   {
       cin >> k;
       object.addNumber(k);
   }
   cout << "Enter the number of elements to be deleted : ";
   cin >> n;
   cout << "Enter the elements to delete : ";
   for (i = 0; i < n; i++)
   {
       cin >> k;
       object.removeNumber(k);
   }
   cout << "Displaying the contents of the array : ";
   object.output();
}

Answer 1

// vararray.h

#ifndef VARARRAY_H_

#define VARARRAY_H_

class varArray{

public:

varArray(); // void constructor

int arraySize() const {return size;} // returns the size of the array

int check(double number); // returns index of element containg "number" or -1 if none

void addNumber(double);    // adds number to the array

void removeNumber(double); // deletes the number from the array

void output();      // prints the values of the array

// big three

varArray(const varArray&); // copy constructor

varArray& operator=(const varArray&); // overloaded assignment

~varArray(); // destructor

private:

double *dArray; // pointer to the dynamically allocated array

int size;   // array size

};

#endif /* VARARRAY_H_ */

//end of vararray.h

// varArray.cpp

#include <iostream>

#include "vararray.h"

using std::cin; using std::cout; using std::endl;

varArray::varArray()

{

       dArray = new double[0];

       size = 0;

}

varArray::varArray(const varArray &org)

{

       size = org.size;

       dArray = new double[size];

       for(int i=0;i<size;i++)

             dArray[i] = org.dArray[i];

}

varArray& varArray::operator=(const varArray& other)

{

       if(this != &other)

       {

             delete dArray; // deallocate the earlier allocated array

             size = other.size;

             dArray = new double[size];

             for(int i=0;i<size;i++)

                    dArray[i] = other.dArray[i];

       }

       return *this;

}

varArray::~varArray()

{

       delete dArray;

       size = 0;

}

void varArray::output()

{

       cout<<endl;

        for (int c = 0; c < size; c++)

                cout << dArray[c] << " ";

        cout<<endl;

}

int varArray::check(double number)

{

        int index = -1;

        // Loops until end of the array

        for (int c = 0; c < size; c++)

        {

                // Checks if current index position value of the array

                // is equals to the parameter number then return

                // c value as found index position

                if (dArray[c] == number)

                        return c;

        }// End of for loop

         // End of the loop returns -1 for not found

        return index;

}

void varArray::addNumber(double number)

{

       // Calls the function to check whether the number is available

       int found = check(number);

       // Checks if the found status is -1 then number not found

       if (found == -1)

       {

             

               double *temp = new double[size + 1];

               for (int c = 0; c < size; c++)

                       temp[c] = dArray[c];

               // Increase the size by one

               size++;

               delete dArray; // deallocating the array

               dArray = temp;

               // Assigns the parameter number to existing array last position

               dArray[size - 1] = number;

       }// End of if condition

        // Otherwise number found

       else

             cout << "\n The number found at: " << found << "\n Cannot add duplicate number."<<endl;

}

void varArray::removeNumber(double number)

{

        // Calls the function to check whether the number is available

        int found = check(number);

        // Checks if the found status is not -1 then number found

        if (found != -1)

        {

                double *temp = new double[size];

                for (int c = found; c < size; c++)

                        dArray[c] = dArray[c + 1];

                // Loops till end of the existing array

                // Assign each element of the existing array to temp array

                for (int c = 0; c < size; c++)

                        temp[c] = dArray[c];

                // Decrease the size by one

                size--;

                delete dArray; // deallocating the array

                // Resize the existing array with new size

                dArray = new double[size];

                // Loops till end of the array minus one term

                // and assign each element of the temp array to existing array

                for (int c = 0; c < size; c++)

                        dArray[c] = temp[c];

        }// End of if condition

         // Otherwise number not found

        else

                cout << "\n The number " << number << " not found."<<endl;

}

//end of varArray.cpp

// varMain.cpp

#include <iostream>

#include "vararray.h"

using std::cout; using std::endl; using std::cin;

int main(){

       double i, k, n;

          varArray object;

          cout << "Enter the size of array : ";

          cin >> n;

          cout << "Enter the array elements : ";

          for (i = 0; i < n; i++)

          {

              cin >> k;

              object.addNumber(k);

          }

          cout << "Enter the number of elements to be deleted : ";

          cin >> n;

          cout << "Enter the elements to delete : ";

          for (i = 0; i < n; i++)

          {

              cin >> k;

              object.removeNumber(k);

          }

          cout << "Displaying the contents of the array : ";

          object.output();

   return 0;

}

//end of varMain.cpp

Output: