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Simple Vector
Tuesday, 29 April 2008
Simple Vector

#include <iostream>
#include <iomanip>
#include <vector>
#include <new>

using namespace std;

template <class T>
class SimpleVector
{
      private:
           T* aptr;
           T* bptr;
           int arraySize;
           void memError()
           {
             cout<<"   Memory allocation error!"<<endl;
             exit(54);
             }
          void subError()
          {
            cout<<"   Subscript out of range!"<<endl;
                  exit(54);
            }
      public:
          SimpleVector()
          {
                  aptr = 0;
               arraySize = 0;
             }
          SimpleVector(int s)
          {
                  arraySize = s;
               try
               {
                     aptr = new T [s];
               }
               catch (bad_alloc)
               {
                     memError();
                  }
               for (int count = 0; count < arraySize; count++)
               {
                      *(aptr + count) = 0;
                  }  
            }
         SimpleVector(const SimpleVector &obj)
         {
                  arraySize = obj.arraySize;
               aptr = new T [arraySize];
               if(aptr==0)
               {
                       memError();
                  }
               for(int count=0; count<arraySize; count++)
               {
                       *(aptr + count) = (obj.aptr + count);
                  }
            }
         ~SimpleVector()
         {
                  if(arraySize > 0)
               delete [] aptr;
            }
         int size()
         {
                  return arraySize;
            }
         T &operator[] (const int &sub)
         {
                  if(sub < 0 || sub > arraySize)
               {
                         subError();
                  }
               return aptr[sub];
         }
         void pushBack( T val)
         {
              bptr = new T[arraySize+1];
              for(int count=0; count<arraySize; count++)
              {
                         *(bptr + count) = *(aptr + count);
                 }
              *(bptr + arraySize)=val;
                 delete[] aptr;
                 aptr=bptr;
                 arraySize++;
           }
        void popBack()
        {
                bptr = new T[arraySize-1];
             for(int count=0; count<arraySize-1; count++)
             {
                        *(bptr + count) = *(aptr + count);
                }
             delete[] aptr;
             aptr=bptr;
             arraySize--;
           }
        int getArraySize()
        {
               return arraySize;
           }
};

void Clear_Screen(void);
void Flush(void);

int main()
{
      int num =0;
      SimpleVector<int> vect;
      cout << "Initialize vector's first element to 0\n" << endl;  
      vect.pushBack(0);
      cout << "   Displaying vector's content: ";
      for(int i=0; i<vect.getArraySize(); i++)
      {
           cout<<vect[i]<<endl;
      }
      cout << endl;
      system ("pause");
      Clear_Screen();
      cout<<"Enter a number to add as the vector's second element\n"<<endl;
      cin >> num;
      vect.pushBack(num);
      cout << "Displaying vector's content: ";
      for(int i=0; i<vect.getArraySize(); i++)
      {
           cout << vect[i] << "  ";
      }
      cout << endl;
      system ("pause");
      Clear_Screen();
      cout<<"Enter a number to add as the vector's third element\n"<<endl;
      cin >> num;
      vect.pushBack(num);
      cout << "Displaying vector's content: ";
      for(int i=0; i<vect.getArraySize(); i++)
      {
           cout << vect[i] << "  ";
      }
      cout << endl;
      system ("pause");
      Clear_Screen();
      cout<<"Remove last vector's element\n" << endl;
      vect.popBack();
      cout << "Displaying vector's content: ";
      for(int i=0; i<vect.getArraySize(); i++)
      {
           cout << vect[i] << "  ";
      }
      cout << endl;
      system ("pause");
      Clear_Screen();
      cout<<"Remove the second vector's element\n"<<endl;
      vect.popBack();
      cout << "Displaying vector's content: ";
      for(int i = 0; i < vect.getArraySize(); i++)
      {
           cout << vect[i] << "  ";
      }
      cout << endl;
      system ("pause");
      Clear_Screen();
      cout<<"Resize vector to 10 elements and initialize them to 888\n"<<endl;
      SimpleVector<int> temp(10);
      cout << "Displaying vector's content: ";
      for(int i = 0; i < 10; i++)
      {
           temp[i]=888;
      }
      for(int i=0; i < 10; i++)
      {
      cout << " " << temp[i] << " ";
   }
   cout << endl;
   system ("pause");
   Clear_Screen();
   cout<<"Enter a number to add to the back of the vector\n"<<endl;
   cin >> num;
   temp.pushBack(num);
   cout << "Displaying vector's content: ";
   for(int i=0; i<temp.getArraySize(); i++)
   {
      cout << " " << temp[i] << " ";
   }
   cout << endl;
   system ("pause");
   Clear_Screen();
   cout << "\n\n   Thank you for using the program!" << endl;
   Flush();
   cout << "\n\n   Press any key to exit" << endl;
   getchar();
   return 0;
}

void Clear_Screen(void)
{
   #ifdef _WIN32
      system("cls");
   #else
      system("clear");
   #endif
}

void Flush(void)
{
   int ch;
   do
   {
      ch = getchar();
   }
   while (ch != EOF && ch != '\n');
   clearerr(stdin);
}


Posted by veronicak5678 at 1:52 PM EDT

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