String::String(const char p[])
{
   // Determine number of characters in string (strlen(p))
   len = 0;
   while (p[len] != '\0')
      len++;
   // Allocate buffer array, remember to make space for NULL character
   buffer = new char[len + 1];
   // Copy new characters (strcpy( buffer, p ))
   for (int i = 0; i < len; i++)
      buffer[i] = p[i];
   buffer[len] ='\0';
}

(Operators as described in chptr. 17)