c++运算符重载

#include 
#include
using namespace std;
class myString
{
private:
    char *str;   //记录c风格的字符串
    int size;            //记录字符串的实际长度
public:
    //无参构造
    myString():size(10)
    {
        str = new char[size];         //构造出一个长度为10的字符串
        strcpy(str,"");
    }
    //有参构造
    myString(const char *s)
    {
        size = strlen(s);
        str = new char[size+1];
        strcpy(str, s);
    }

    //拷贝构造

    myString(myString &others)
    {
        size=others.size;
        str = new char[size+1];
        strcpy(str,others.str);
    }
    //析构函数
    ~myString()
    {
        delete [] str;
        str=nullptr;

    }
    //判空函数
    bool empty()
    {
        if(strlen(str) == 0)
            return true;
        else
            return false;
    }

    //size函数
    int my_size()
    {
        return strlen(str);
    }
    //c_str函数
    int my_c_str()
    {
        return strlen(str);
    }
    //at函数
    char at(int pos)
    {

        if(pos<0 || pos>=size)
            return 'f';
        else
            return str[pos];
    }
    void show()const
    {
        cout<str<str<=this->size)
            return '#';
        else
        {
            return str[n];
        }

    }
    //+号重载
    const myString &operator+(const myString &other)
    {
        strcat(this->str,other.str);
        return *this;
    }
    //>号重载
    bool  operator>(const myString &other)const
    {
        if( strcmp(this->str,other.str)>0)
            return  true;
        else
            return false;
    }
    //设置友元
  friend  myString & operator>>(istream &l,myString &o);
};
//全局函数重载>>
 myString & operator>>(istream &l,myString &o)
{
    l>>o.str;
    return o;
}
int main()
{
    myString s1("qwert");
    s1.show();
    myString s2(s1);
    s2.show();
    cout<s2)
        cout<<"s1>s2"<>s1;
    s1.show();
     return 0;
}