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


class String
{
    char *str;  
	public:

	String() : str(0)	{};

	String(const char *s)
	{
	  if(!*s)
	    str = new char('\0');
	 else
	 {
	    str = new char [ strlen(str) + 1 ];
	 	strcpy (str, s);
	 }
	}

	String(String &s)
	{
	  if(!s.str)  str = s.str;
	  if(s.str)
	  {
		  str = new char [ strlen(s.str) + 1];
		  strcpy(str, s.str);
	  }
	}

	~String()
	{
	  delete [] str;
	}

	int eq(const char *s) const
	{
	  if(!str || !s) return 0;
	  return !strcmp(str,s);
	}

	int eq(String &s) const
	{
	  return eq(s.str);
	}

   int indexOf(char ch, unsigned int fromIndex = 0) const
   {
	   int length = str ? strlen(str) : 0;
	   for( int index = fromIndex; index < length; ++index)
	   {
	     if(ch==str[index]) return index;
	   }
	   return -1;
   }
   
   int indexOf(const char *s, unsigned int fromIndex = 0) const
   {
       if (!str) 
		   return -1;
	   int length = strlen(str);

	   if(length < fromIndex) 
		   return -1;

	   char *p = strstr(str + fromIndex, s);
	   if(!p)
		   return -1;

	   return str-p;
   }
   
   int indexOf(String &s, unsigned int fromIndex = 0) const
   {
      return indexOf(s.str, fromIndex);
   }

   int length(void) const
   {
      return str ? strlen(str) : -1;
   }

   String &operator +(const char *s)
   {
	  if(!s || *s) return *this;

	  if(str) 
	  {
	    if(*str) 
		{
		   delete str; str = 0;
		} else
		{
		   char *p = new char [ strlen(str) + strlen(s) + 1 ];
		   strcpy (p, str);
		   strcat (p, s);
		   delete str;
		   str = p;
		}
	  }
	  if(!str)
	  {
	     str = new char [ strlen(s) + 1];
		 strcpy(str,s);
	  }
      return *this;
   }

   String &operator +(String &s)
   {
	  return (*this) + s.str;
   } 

//   String operator+(const char *s)
//   {
//	 if(s) 
//     int length = strlen(s)
//   }
};



int main(int argc, char *argv[])
{

  String s1;
  String s2("s");
  String s3(s2);

  String s4("");
  String s5(s4);
  
  cout << "s5.eq(\"s\"); "  << s5.eq("s")   << endl << flush;
  cout << "s5.eq(\"\"); "   << s5.eq("")    << endl << flush;
  cout << "s5.eq( s5); "    << s5.eq(s5)    << endl << flush;
  cout << "s5.eq( s4); "    << s5.eq(s4)    << endl << flush;
  cout << "s5.eq( s2); "    << s5.eq(s2)    << endl << flush;
  cout << "s5.length(); "   << s5.length()  << endl << flush;
  cout << "s2.length(); "   << s2.length()  << endl << flush;
  cout << "s2.indexOf(\"s\"); "   << s2.indexOf("s")   << endl << flush;
  cout << "s2.indexOf(\"ss\"); "  << s2.indexOf("ss")  << endl << flush;
  cout << "s2.indexOf(\"s\"); "   << s2.indexOf("")    << endl << flush;
  cout << "s2.indexOf(\"z\"); "   << s2.indexOf("z")   << endl << flush;
  cout << "s2.indexOf(s2); "      << s2.indexOf(s2)    << endl << flush;
  cout << "s2.indexOf(s2, 1); "   << s2.indexOf(s2, 1) << endl << flush;
  cout << "s2.indexOf(s2, 5); "   << s2.indexOf(s2, 5) << endl << flush;

  return 0;
}