C++ mystring补充重载运算符

#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);
            cout<=size)
            {
                cout<<"超出范围"<str=R.str;
            this->size=R.size;
            return *this;
        }

        //访问指定字符函数
        char operator[](int i)
        {
            return this->str[i];
        }
        void show()
        {
            cout<<"str="<size=this->size+R.size;
                strcat(this->str,R.str);
                return *this;
        }

        //比较
        bool operator<(const myString &R)const
        {
            if(strcmp(this->str,R.str)>0)
                return true;
            else
                return false;
        }
        bool operator>(const myString &R)const
        {
            if(strcmp(this->str,R.str)<0)
                return true;
            else
                return false;
        }
        bool operator==(const myString &R)const
        {
            if(strcmp(this->str,R.str)==0)
                return true;
            else
                return false;
        }
        friend ostream &operator<<(ostream &L,const myString&O);
        friend istream &operator>>(istream &L,const myString&O);


};
ostream &operator<<(ostream &L,const myString&O)
{
    L<>(istream &L,const myString&O)
{
    L>>O.str;
    return L;
}
int main()
{
    myString s1("hello");                   //无参构造

    myString s2(s1);                 //调用拷贝构造

    s2.show();


    if(!s2.kong())                      //调用判空函数
    {
        cout<<"为空函数"<s2)
        cout<<">yes"<no"<>s4;
    cout<