#define _CRT_SECURE_NO_WARNINGS

#include <iostream>

#include <cstring>

class MyString

{

    char *_str;

    int _len;

public:

    MyString()

    {

        _str = new char[];

        _len = ;

    }

    MyString(const char *str)

    {

        if (str == NULL)

        {

            _str = new char[];

            *_str = '\0';

        }

        else

        {

            int _len = strlen(str);

            _str = new char[_len + sizeof(char)];

            strcpy(_str, str);

        }

    }

    ~MyString()

    {

        delete[]_str;

    }

    char *GetString()

    {

        return _str;

    }

    //设置字符串

    void SetString(const char *str)

    {

        delete[]_str;

        int _len = strlen(str);

        _str = new char[_len + sizeof(char)];

        strcpy(_str, str);

    }

    //通过下标取得字符

    char GetChar(int index)

    {

        if(index<=strlen(_str) && index >= )

            return _str[index];

        return ;

    }

    //求字符串长度

    unsigned int GetStringLens()

    {

        unsigned int index = ;

        while (_str[index])

        {

            index++;

        }

        return index;

    }

    //求数组的长度

    unsigned int GetArryLens()

    {

        return sizeof(_str) / sizeof(_str[]);

    }

    //批量修改其中的某个字符为其它某个字符

    char * MyCharReplace(char dest,char source)

    {

        while (*_str!='\0')

        {

            if (*_str == dest)

            {

                *_str = source;

            }

            *_str++;

        }

        return _str;

    }

    //在末尾追加字符

    void MyAddEnd(char c)

    {

        char tmp[] = { c,'\0' };

        MyString::MyAddEnd(tmp);

    };

    // 在末尾追加字符串

    void MyAddEnd(char *str)

    {

        _str = strncat(_str, str, strlen(str) + sizeof(char));

    }

    // 在末尾追加整数

    void MyAddEnd(int num)

    {

        char tmp[]={};

        sprintf(tmp,"%d",num);

        MyString::MyAddEnd(tmp);

    }

    //在末尾追加浮点数

    void MyAddEnd(double num)

    {

        char tmp[] = {  };

        sprintf(tmp, "%8.3lf", num);

        MyString::MyAddEnd(tmp);

    }

    //在末尾追加MyString

    void MyAddEnd()

    {

        _str = strncat(_str, _str, strlen(_str) + sizeof(char));

    }

    //从头 弹出一个字符

    char PopupHead()

    {

        int index = ;

        char tmp = _str[index];

        while(_str[index]!=)

        {

            _str[index] = _str[index + ];

            index++;

        }

        return tmp;

    }

    //从末尾弹出一个字符

    char PopupEnd()

    {

        int index = ;

        while (_str[index] != )

        {

            index++;

        }

        char tmp = _str[index-];

        _str[index-] = ;

        return tmp;

    }

};

int main()

{

    MyString demo1("我爱你中国！");   //MyString demo2();

    MyString demo("I Love Mark");

    demo.SetString("i love HaoZaiYi");

    std::cout << demo.GetString() << "  "<<demo.GetChar() << std::endl;

    std::cout << demo.GetStringLens() << "  " << demo.GetArryLens() << std::endl;

    demo.MyAddEnd('y');

    std::cout <<  demo.GetString() << std::endl;

    demo.MyAddEnd("aaaaa");

    std::cout << demo.GetString() << std::endl;

    demo.MyAddEnd();

    std::cout << demo.GetString() << std::endl;

    demo.MyAddEnd(123456.789);

    std::cout << demo.GetArryLens() << std::endl;

    std::cout << demo.PopupHead() << demo.PopupEnd() << std::endl;

    std::cout << demo.PopupHead() << demo.PopupEnd() << std::endl;

    std::cout << demo.PopupHead() << demo.PopupEnd() << std::endl;

    std::cout << demo.PopupHead() << demo.PopupEnd() << std::endl;

    std::cout << demo.MyCharReplace('o','@') << "   "<< demo.GetString() << std::endl;

      return ;

}