//mystring.h
#pragma once
#include <iostream>
using std::ostream;
using std::istream;
using std::cin;
using std::cout;
class string
{
    char *buf;
public:
    string(const char *buf=0);
    bool operator==(const string &src)const;
    bool operator!=(const string &src)const;
    bool operator>(const string &src)const;
    bool operator>=(const string &src)const;
    bool operator<(const string &src)const;
    bool operator<=(const string &src)const;
    void view(ostream &os=cout)const;
    const char *c_str()const;
    friend ostream &operator<<(ostream &os,const string &src);
    friend istream &operator>>(istream &is,string &src);
};