C++习题 对象转换（定义一个Teacher(教师)类（教师号，姓名，性别，薪金）和一个Student(学生)类（学号，姓名，性别，成绩）编写程序，将一个Student对象(学生)转换为Teacher(教师)类。

 1 #include<iostream> 
 2 #include<iomanip> 
 3 #include<cstring> 
 4 using namespace std; 
 5 class Teacher; 
 6 class Student 
 7 {public: 
 8     void display() 
 9     {cout<<"num:"<<num<<endl<<"name:"<<name<<endl<<"sex:"<<sex<<endl<<"score:"<<score<<endl;} 
10     Student(){}; 
11     Student(int m,char n[20],char x,float s) 
12     {num=m;strcpy(name,n);sex=x;score=s;} 
13     int num; 
14     char name[20]; 
15     char sex; 
16     float score; 
17 }; 
18   
19 class Teacher 
20 { 
21 public: 
22     void setpay(float a) 
23     {pay=a;} 
24     void display() 
25     {cout<<"num:"<<num<<endl<<"name:"<<name<<endl<<"sex:"<<sex<<endl<<"pay:"<<pay<<endl;} 
26     Teacher(){}; 
27     Teacher(int m,char n[20],char x,float p) 
28     {num=m;strcpy(name,n);sex=x;pay=p;} 
29     Teacher(Student & s) 
30     { 
31         num=s.num; 
32         strcpy(name,s.name); 
33         sex=s.sex; 
34     } 
35 private: 
36     int num; 
37     char name[20]; 
38     char sex; 
39     float pay; 
40 }; 
41 int main() 
42 { 
43     cout<<setiosflags(ios::fixed); 
44     cout<<setprecision(2); 
45     int num; 
46     char name[20]; 
47     char sex; 
48     float score; 
49     float pay; 
50     cin>>num>>name>>sex>>pay; 
51     Teacher teacher1(num,name,sex,pay); 
52     cin>>num>>name>>sex>>score; 
53     Student student1(num,name,sex,score); 
54     cout<<"student1:"<<endl; 
55     student1.display(); 
56     Teacher teacher2=Teacher(student1); 
57     teacher2.setpay(1500); 
58     cout<<"teacher2:"<<endl; 
59     teacher2.display(); 
60     return 0; 
61 }