修改并完善此代码#include<iostream> using namespace std; #include<cstring> class Teacher { public: Teacher() { } Teacher(char *p,int a) { pname=new char[20]; strcpy(pname,p); age=a; } Teacher(Teacher &t):pname(t.pname),age(t.age) { pname=new char[20]; //strcpy(pname,t.pname); } ~Teacher() { delete []pname; } Teacher& operator =(Teacher &t) { delete []pname; pname=new char[strlen(t.pname)+1]; strcpy(pname,t.pname); age=t.age; return *this; } void Disp() { cout<<"Teacher:"<<pname<<","<<age<<endl; } private: char *pname; //存名字的地址 int age; }; class Student { public: Student() { } Student(char *n,int s) { strcpy(name,n); score=s; } void Disp() { cout<<"Student:"<<name<<","<<score<<endl; } protected: char name[10]; int score; }; class Tutor { public: Tutor() { } Tutor(char *n1,int s,char *n2,int a):s(n1,s),t(n2,a) { num=0; } Tutor(Tutor &t):s(t.s),t(t.t) { num=t.num; } void Date() { num++; } void Disp() { s.Disp(); t.Disp(); cout<<"Num:"<<num<<endl; } protected: Student s; Teacher t; int num;//存储师生会面次数 }; int main() { char name1[15],name2[15]; int score,age; cin>>name1>>score>>name2>>age; Tutor tt1(name1,score,name2,age),tt2; tt1.Disp(); tt1.Date(); //师生碰面一次 tt2=tt1; //此处调用的哪段代码？ tt2.Disp(); Tutor tt3=tt1; //此处调用的哪段代码？ tt3.Date(); tt3.Disp(); return 0; }

修改后的代码如下： ``` #include<iostream> #include<cstring> using namespace std; class Teacher { public: Teacher() { pname = NULL; age = 0; } Teacher(char* p, int a) { pname = new char[strlen(p) + 1]; strcpy(pname, p); age = a; } Teacher(const Teacher& t) { pname = new char[strlen(t.pname) + 1]; strcpy(pname, t.pname); age = t.age; } Teacher& operator=(const Teacher& t) { if(this != &t) { delete[] pname; pname = new char[strlen(t.pname) + 1]; strcpy(pname, t.pname); age = t.age; } return *this; } ~Teacher() { delete[] pname; } void Disp() { cout << "Teacher:" << pname << "," << age << endl; } private: char* pname; int age; }; class Student { public: Student() { name[0] = '\0'; score = 0; } Student(char* n, int s) { strcpy(name, n); score = s; } void Disp() { cout << "Student:" << name << "," << score << endl; } protected: char name[10]; int score; }; class Tutor { public: Tutor() { num = 0; } Tutor(char* n1, int s, char* n2, int a) : s(n1, s), t(n2, a) { num = 0; } Tutor(const Tutor& t) : s(t.s), t(t.t) { num = t.num; } void Date() { num++; } void Disp() { s.Disp(); t.Disp(); cout << "Num:" << num << endl; } protected: Student s; Teacher t; int num; }; int main() { char name1[15], name2[15]; int score, age; cin >> name1 >> score >> name2 >> age; Tutor tt1(name1, score, name2, age), tt2; tt1.Disp(); tt1.Date(); //师生碰面一次 tt2 = tt1; //调用赋值运算符函数 tt2.Disp(); Tutor tt3 = tt1; //调用拷贝构造函数 tt3.Date(); tt3.Disp(); return 0; } ``` 主要修改的地方是： 1. 修改了Teacher类的构造函数、拷贝构造函数、赋值运算符函数和析构函数，保证了对象之间的独立性和数据的正确性。 2. 修改了Student类的构造函数，初始化name数组为空字符串。 3. 修改了Tutor类的构造函数和拷贝构造函数，使用成员初始化列表初始化数据成员。 4. 在main函数中，创建了两个Tutor对象，并测试了赋值运算符函数和拷贝构造函数的正确性。