#pragma once
#include <iostream>
#include <cstring>
using namespace std;

class String {
public:
    String();
    String(const char*);
    String(const char);
    ~String();
    String(const String&);
    String& operator=(const String&);
    String& operator=(const char*);
    char operator[](int);
    friend String operator+(const String&,const String&);

    //
    friend bool operator==(const String&, const String&);
    friend bool operator==(const char*, const String&);
    friend bool operator==(const String&, const char*);
    //
    friend bool operator !=(const String&,const String&);
    friend bool operator !=(const char*, const String&);
    friend bool operator !=(const String&, const char*);
    //
    friend bool operator <(const String&, const String&);
    friend bool operator <(const char*, const String&);
    friend bool operator <(const String&, const char*);
    //
    friend bool operator >(const String&, const String&);
    friend bool operator >(const char*, const String&);
    friend bool operator >(const String&, const char*);
    //
    friend bool operator <(const String&, const String&);
    friend bool operator <(const char*, const String&);
    friend bool operator <(const String&, const char*);
    //
    friend bool operator >=(const String&, const String&);
    friend bool operator >=(const char*, const String&);
    friend bool operator >=(const String&, const char*);
    void setString(const char*);
    void setString(const char);
    const char* getString()const;
    void append(const char*);
    void append(const char);
    void print()const;
    int length()const;
    bool empty()const;
    const char* c_str()const;
    friend istream& operator>>(istream&, String&);
    friend ostream& operator<<(ostream&, const String&);
private:
    char* string;
};