#include<iostream.h>
 #include<string.h>
 class string
 {
 private :
	int   m_nLen;
	char *m_pStr;
 public :
	string( );
	string(int);
	string::string(const char * const str);
	string(const string &);
	string::~string( );
	friend ostream & operator<<(ostream &os, string &temp);
 };
 string::string( )
 {
	m_pStr=NULL;
	m_nLen=0;
 }
 string::string(int n)
 {
	m_nLen = n;
	m_pStr = new char[m_nLen];
	memset(m_pStr,'\0',m_nLen);
  }
  string::string(const char * const str)
  {
	m_nLen = strlen(str);
	m_pStr = new char[m_nLen];
	strcpy(m_pStr, str);
  }

  string::string(const string &temp)
  {
   m_nLen = temp.m_nLen;
   m_pStr = new char[m_nLen];
   strcpy(m_pStr, temp.m_pStr);
 }

   string::~string( )
  {

       delete [ ]m_pStr;
       m_nLen = 0;
  }

 ostream & operator<<(ostream &os, string &temp)
 {
	os<<temp.m_pStr;
	return os;
 }

 void main( )
 {
	string str;      //µðÆúÆ® »ý¼ºÀÚ
	cout<<str;

	cout<<"\n¹®ÀÚ¿­À» ÃʱⰪÀ¸·Î ÇÏ´Â »ý¼ºÀÚ·Î °´Ã¼ »ý¼º\n";
	string str2("°Ü¿ïÀÇ ¹®ÅÎ");
	cout<<str2;

	cout<<"\nº¹»ç »ý¼ºÀÚ·Î °´Ã¼ »ý¼º\n";
	string str3(str2);
	cout<<str3;

 }