程序代码：

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <string.h>
#include <string>
using namespace std;
class str
{
public:
    str(char *name);
    void print(str &str);
    int Size(str &str);
    static void exchange(str &str1, str &str2);
    static void Connect(str &str1, str &str2);
    ~str();
protected:
    char *name;
    int size = 0;
};
str::str(char *name)
{
    this->name = new char[strlen(name) + 1];
    this->name = name;
    this->size = strlen(name) + 1;
}
void str::print(str &str)
{
    for (int i = 0; i < str.size; i++)
    {
        cout << name[i];
    }
    cout << endl;
}
int str::Size(str &str)
{
    return str.size;
}
void str::exchange(str &str1, str &str2)
{
    if (str1.Size(str1) < str2.Size(str2))
    {
        str1.name = new char[str2.Size(str2) - 1];
        memset(str1.name, 0, str2.Size(str2) - 1);
        strcpy(str1.name, str2.name);
        str1.size = str2.Size(str2) - 1;
    }
    str1.name = str2.name;
}
void str::Connect(str &str1, str &str2)
{
    char *str3 = new char[(str1.Size(str1) + str2.Size(str2)) - 1];
    memset(str3, 0, (str1.Size(str1) + str2.Size(str2)) - 1);
    strcat(str3, str1.name);
    strcat(str3, str2.name);
    str1.name = new char[(str1.Size(str1) + str2.Size(str2)) - 1];
    memset(str1.name, 0, (str1.Size(str1) + str2.Size(str2)) - 1);
    str1.name = str3;
    str1.size = (str1.Size(str1) + str2.Size(str2)) - 1;
}
str::~str()
{

    cout << "析构函数" << endl;
}
int main()
{
    str mystr = "I LOVE YOU";
    cout << "对象大小:" << mystr.Size(mystr) << endl;
    cout << "对象为:";
    mystr.print(mystr);
    cout << endl;
    str mystr1 = "I hate you";
    str mystr2 = "I miss you123";
    cout << "新对象1为:";
    mystr1.print(mystr1);
    cout << "新对象2为:";
    mystr2.print(mystr2);
    cout << "对象复制操作" << endl;
    str::exchange(mystr1, mystr2);
    cout << "复制后对象1为:";
    mystr1.print(mystr1);
    cout << "复制后对象2为:";
    mystr2.print(mystr2);
    str mystr3 = "I hate you";
    str mystr4 = "I miss you";
    cout << "连接操作:";
    str::Connect(mystr3, mystr4);
    mystr3.print(mystr3);
    system("pause");
    return 0;
}