注释处语句有错误需改正，求解答

Question

#define _CRT_SECURE_NO_WARNINGS
#include
#include
using namespace std;

class Course
{
int count; //
char Objname[10];
char *Descrip;
public:
Course(const char *obj, const char *des) //
{
strcpy(Objname, obj);
if (des)
{
Descrip = new char[strlen(des) + 1];
strcpy(Descrip, des);
}
else
{
Descrip = 0;
}
count += 1;
}

Course(const Course &r) : Descrip(0)
{
    strcpy(Objname, r.Objname);
    if (r.Descrip)                       
    {
         Descrip = new char[strlen(r.Descrip) + 1];
        strcpy(Descrip, r.Descrip);
    }
    count += 1;
}
~Course()
{
    if (Descrip)
        delete[] Descrip;
    count--;
}

public:
Course &operator=(const Course &r)
{
if (Descrip)
delete[] Descrip, Descrip = 0;

    if (r.Descrip)
    {
        Descrip = new char[strlen(r.Descrip) + 1];
        strcpy(Descrip, r.Descrip);
    }
    strcpy(Objname, r.Objname);
    return this;                                   //
}
void operator+=(const char *des)
{
    if (!des || !*des)
        return;
    int len = strlen(des);
    if (Descrip)
        len += strlen(Descrip);

    char *s = new char[len + 1];
    s = 0;                                    //
    strcpy(s, Descrip);
    strcat(s, des);
    if (Descrip)
        delete[] Descrip;
    Descrip = s;
}

void show()
{
    if (Descrip && *Descrip)
        cout << "Object: " << Objname << ".  Description: " << Descrip << ".  Count: " << count << endl;
    else
        cout << "Object: " << Objname << ".  Description is null.  Count: " << count << endl;
}

};

int Course::count = 0;

int main()
{
Course *s1 = new Course("s1");
s1->show();
Course s2(s1); //
delete s1;
Course s3("s3", "C++ Programming"), s4("s4", "College Physics");
s2.show();
s2 = s3;
s2.show();
s2 = s4;
s2 += ",College English";
s2.show();
}

Answer 1

int count=0
Course s2(s1);，你对指针引用，要么把函数里的.都改为->，要么不使用指针对象，你还是改函数吧