1、完成下面类

#include <iostream>
#include <cstring>
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,"");cout << "myString的无参构造" << endl;}//有参构造myString(const char *s){size = strlen(s);str = new char[size+1];strcpy(str,s);cout << "myString的有参构造" << endl;}//拷贝构造myString(const myString &other):str(new char(*(other.str))),size(other.size){cout << "myString的拷贝构造函数" << endl;}//析构函数~myString(){delete str;str = nullptr;}//判空函数int myempty(){if(size == 0){cout << "为空" << endl;}return size==0;}//size函数int mysize(){return size;}//c_str函数char *myc_str(){str[size+1] = '\0';return str;}//at函数char &at(int pos){if(pos >= 0 && pos < size){return str[pos];}else{cout << "越界" << endl;return str[0];}}void show(){cout << "str = " << str << endl;cout << "size = " << size << endl;}
};int main()
{myString s1;s1.show();myString s2("Hello World");s2.show();myString s3(s2);return 0;
}