关于MyString类的构造函数，析构函数，拷贝构造函数。-About MyString class constructor, destructor, copy constructor.

Write an EXE program that accepts a string from the keyboard, converts it to HEX (this algorithm should also check to see if the input is a number), and stores it. It should take a second string and convert it to HEX, then add the two numbers,

编写一个函数模板，它返回两个值中的最小者，但同时要确保这个函数模板能正确处理字符串。并编写主函数，实现两个字符串中最小者的输出。 适合初学者对c++函数模板的入门-Write a function template, which returns the minimum of the two values, but at the same time to ensure that the function template to correctly handle the string. And