// p239.cpp  - VString Class Example, p. 239

// This introduces the beginnings of a Variable-length string class.

#include <string.h>
#include <iostream.h>

class VString {
public:
  VString( unsigned len = 0 );
  // Construct a VString of size <len>.

  VString( const char * s );
  // Construct a VString from a C-style string.

  ~VString();
  // Destructor

  unsigned GetSize() const;
  // Return the number of characters.

private:
  char * str;      // character array
  unsigned size;   // allocation size
};

VString::VString( unsigned len )
{
  size = len;
  str = new char[ size+1 ];
  str[0] = '\0';
}

VString::VString( const char * s )
{
  size = strlen( s );
  str = new char[ size+1 ];
  strcpy( str, s );
}

VString::~VString()
{
  delete [] str;
}

unsigned VString::GetSize() const
{
  return size;
}


int main()
{

VString zeroLen;
VString emptyStr( 50 );
VString aName( "John Smith" );
cout << aName.GetSize() << endl;

 return 0;
}