C + + string overloading operator

#include <iostream.h> #include <string.h>//using namespace Std;class cstring{public:cstring () {p = new char[ 1];*p = ' + ';} Cstring (const char *t); Cstring (const Cstring &t); ~cstring () {delete[]p;} BOOL operator< (const Cstring &t) const;friend bool operator > (const Cstring &str1,const Cstring &AMP;STR2); cstring& operator= (const Cstring &t); Cstring operator+ (const Cstring &t) Const;bool operator== (const Cstring &t) const;char& operator[] (int index ); void Show () {Cout<<p<<endl;} Private:char *p;}; cstring::cstring (const char *t) {if (t = = NULL) T = ""; int n = strlen (t);p = new char[n+1];strcpy (p,t);} cstring::cstring (const Cstring &t) {p = new Char[strlen (T.P) +1];strcpy (P,T.P);}                                                BOOL Cstring::operator < (const Cstring &t) const{if (strcmp (P, T.P) < 0) return true; else return false;} BOOL operator > (const Cstring &str1, const Cstring &AMP;STR2) {if (strcmp (STR1.P, STR2.P) > 0) retUrn true; else return false;} BOOL Cstring::operator = = (Const Cstring &t) Const{return strcmp (p,t.p) = = 0;} char& Cstring::operator [] (int index) {return p[index];} Cstring Cstring::operator + (const Cstring &t) Const{char *pt;pt = new Char[strlen (p) +strlen (T.P) +1];strcpy (pt,p); strcat (PT,T.P); Cstring Temp (PT);d Elete[]pt;return temp;} cstring& Cstring::operator = (const Cstring &t) {if (this = = &t) return *this;delete[]p;p = new Char[strlen (T.P) +1];strcpy (P,T.P); return *this;} void Main () {Cstring S1 ("Hello"); Cstring S2 ("World"); Cstring s3;s1. Show ()//if (s1[0]>= ' A ' &&s1[0]<= ' Z ')//s1[0] = s1[0]+32;//S1. Show (); cout << (S1&GT;S2) <<endl;cout << (s1<s2) <<endl;s3 = S1;s3. Show (); s3 = S1+s2;s3. Show ();}

Under VC6.0, if you change the header file to:

#include <iostream>
#include <string.h>
using namespace Std;

The following error will occur

Error C2248: ' P ': cannot access private member declared in class ' Cstring '

C + + string overloading operator