#include #include #include class Tstring { private: char *str; int size; public: Tstring(); ~Tstring(); Tstring & operator=(char *); Tstring & operator=(const Tstring &); friend int operator==(Tstring &,Tstring &); friend int operator!=(Tstring &,Tstring &); friend Tstring operator+(Tstring &,Tstring &); friend Tstring operator-(Tstring &,Tstring &); friend ostream & operator<<(ostream &,Tstring &); friend istream & operator>>(istream &,Tstring &); }; //------------------------------------------------------构造析构函数------------- Tstring::Tstring() { str=NULL; } Tstring::~Tstring() { delete str; } //------------------------------------------------------赋值函数---------------- Tstring & Tstring::operator=(char *s) { size=strlen(s)+1; str=new char[size]; if(str==NULL) { cout<<"Tstring::operator=(char *)--Error!"<str; len=s1.size+s2.size-1; temp->str=new char[len]; if(temp->str==NULL) { cout<<"Tstring operator+(Tstring &,Tstring &)--Error!"<size=len; strcpy(temp->str,s1.str); strcat(temp->str,s2.str); return *temp; } Tstring operator-(Tstring &s1,Tstring &s2) { Tstring *temp; temp=new Tstring; delete [] temp->str; int len; len=s1.size-s2.size+1; temp->str=new char[len]; if(temp->str==NULL) { cout<<"Tstring operator-(Tstring &,Tstring &)--Error!"<str[i]=s1.str[i]; temp->str[n]='\0'; strcat(temp->str,q); return *temp; } //------------------------------------------------------输入输出函数------------ istream & operator>>(istream &istr,Tstring &s) { char *x; int n; cout<<"Input string length:"; istr>>n; x=new char[n]; if(x==NULL) { cout<<"istream & operator>>(istream &,Tstring &)--Error!"<>x[i]; x[n]='\0'; s=x; delete [] x; return istr; } ostream & operator<<(ostream &ostr,Tstring &s) { ostr<>a; cout<<"String-1 is:"<>b; cout<<"String-2 is:"<>d; cout<<"String-3 is:"<