class IntArray
{
public: // operations performed on arrays
   IntArray( int s = 24 ); // default value
   IntArray( const IntArray& );  
   ~IntArray(){ delete data; }
   IntArray& operator=( const IntArray& );
   int& operator[]( int );
   IntArray operator+( const IntArray& ) const;
   int getSize() const { return size; }
private:
// internal data representation
   int size;
   int* data; // points to heap-allocated storage
};

IntArray::IntArray( int s )
{	 size = s;
    data = new int[ size ];
    for ( int i = 0; i < s; ++i )
          data[ i ] = 0;			
}

IntArray::IntArray( const IntArray &b )
{
    size = b.size;
    data = new int[ size ];
    for ( int i = 0; i < size; ++i )
          data[ i ] = b.data[ i ];
}

IntArray&  IntArray::operator=( const IntArray &b )
{
   if( data != b.data )  
   {
      delete data;       
      size = b.size;
      data = new int[ size ];
      for( int i = 0; i < size; ++i ) 
            data[ i ] = b.data[ i ];
   }
   return *this;         
} 

int& IntArray::operator[]( int index ) 
{
   return data[ index ]; 
} 

IntArray  IntArray::operator+( const IntArray& b ) 
    const	
{
   IntArray r( size > b.size ? *this : b );	
   if( size > b.size )	
   {
      for( int i = 0; i < b.size; i++ )
         r.data[i] += b.data[i];
   }
   else
   {
      for( int i = 0; i < size; i++ )
         r.data[i] += data[i];
   }
   return r;	
}