#include <cctype>
#include <iostream>
#include <fstream>
#include <string>
#include <cstring>
#include <cstdio>
#include <sstream>
#include <algorithm>
#include <functional>
#include <iomanip>

using namespace std ;

class mystring
{
  public:
    char* ptr ;
   //TO DO set the pointer to NULL
   // in the empty constructor
	mystring( )
	{
	}

			/*
			TO DO Write the copy constructor
			*/
//Copy constructor
		mystring( const mystring& obj1 )
		{
		   //remove current block
		   //printf( "%p\n" , ptr ) ;
		   printf( "Inside the copy constructor. %s \n" , obj1.ptr ) ;
		  //if ( ptr != NULL )
		  //   delete[] ptr ;


		}


		mystring( const char* str1 )
		{
			cout << "Inside the constructor with a single argument." << endl ;
			if ( str1 == NULL )
			  ptr = NULL ;
			else
			 {
				  int len  = strlen( str1 ) + 1;
				  ptr = new char[ len ] ;
				  strcpy ( ptr, str1 ) ;
			 }
		}

    //assignment operator
	mystring&  operator=( const mystring& param1 )
	{
	  printf( "Inside the equal operator.\n" ) ;
	  if ( param1.ptr == NULL )
	   {
		   ptr = NULL ;
	   }
	  else
	   {
			  int len  = strlen( param1.ptr  ) + 1;
			  ptr = new char[ len ] ;
			  strcpy ( ptr, param1.ptr ) ;
	   }

	   return *this ;
	}
    /*
      TO DO Complete the code for the + operator
      Be sure to consider the cases where the current object
      or param1 or both may contain empty strings. You can use
      strcpy and strcat functions.
    */

	mystring  operator+( const mystring& param1 )
	{


	   return *this ;
	}

	~mystring()
	{
		cout << "Inside the destructor." << endl ;
		if ( ptr != NULL )
		  delete[] ptr ;
	}

	void print()
	{
		if ( ptr != NULL )
		  cout << ptr << endl ;
	}

};

int main()
{
    mystring str1 ;
    mystring str2 = str1 ;
    str1.print() ;
    str2.print() ;
    cout << "------" << endl ;
    mystring str3( "Lennox Lewis" )  ;
    mystring str4 = str1 ;

    str3.print() ;
    str4.print() ;
    cout << "------" << endl ;
    mystring str5 = " was pretty good." ;
    mystring str6 = str3 + str5 ;
    str6.print() ;
    cout << "------" << endl ;

	return 0 ;
}