第三周实验报告（任务1）

比眉伴天荒 2022-06-14 08:08 224阅读 0赞

#include <iostream>  
    using namespace std;  
    class Student      
    {  
    public:     
        void set_data(int n, char *p,char s);  
        void display( );  
    private:   
        int num;  
        char name[20];       
        char sex;       
    };  
      
    void Student::set_data(int n, char *p,char s)  
    {  
        num=n;   
        strcpy(name,p);   
        sex=s;  
    }  
    void Student::display( )       
    {  
        cout<<"num: "<<num<<endl;  
        cout<<"name: " <<name<<endl;   
        cout<<"sex: " <<sex<<endl;     
    }   
    int main()  
    {  
        Student stud1,stud2;        
        stud1.set_data(1,"He",'f');  
        stud2.set_data(2,"She",'m');  
        stud1.display();  
        stud2.display();  
        return 0;  
    }  
    
    
    
    //找错误1：违反封装原则，直接给私有成员赋值，访问私有对象
    /*int main()  
    {  
        Student stud1,stud2;   
    	num=1;
    	name=she;
    	sex=m;
        stud1.set_data(1,"He",'f');  
        stud2.set_data(2,"She",'m');  
        stud1.display();  
        stud2.display();  
        return 0;  
    }  
    --------------------Configuration: 1 - Win32 Debug--------------------
    Compiling...
    1.cpp
    C:\Documents and Settings\user\桌面\程序设计\1.cpp(29) : error C2065: 'num' : undeclared identifier
    C:\Documents and Settings\user\桌面\程序设计\1.cpp(30) : error C2065: 'name' : undeclared identifier
    C:\Documents and Settings\user\桌面\程序设计\1.cpp(30) : error C2065: 'she' : undeclared identifier
    C:\Documents and Settings\user\桌面\程序设计\1.cpp(31) : error C2065: 'sex' : undeclared identifier
    C:\Documents and Settings\user\桌面\程序设计\1.cpp(31) : error C2065: 'm' : undeclared identifier
    Error executing cl.exe.
    
    1.obj - 5 error(s), 0 warning(s)*/
    
    
    //在实现对类成员函数时不指定作用域
    /*void set_data(int n, char *p,char s)  
    {  
        num=n;   
        strcpy(name,p);   
        sex=s;  
    }  
    void Student::display( )       
    {  
        cout<<"num: "<<num<<endl;  
        cout<<"name: " <<name<<endl;   
        cout<<"sex: " <<sex<<endl;     
    }   
    --------------------Configuration: 1 - Win32 Debug--------------------
    Compiling...
    1.cpp
    C:\Documents and Settings\user\桌面\程序设计\1.cpp(16) : error C2065: 'num' : undeclared identifier
    C:\Documents and Settings\user\桌面\程序设计\1.cpp(17) : error C2065: 'name' : undeclared identifier
    C:\Documents and Settings\user\桌面\程序设计\1.cpp(18) : error C2065: 'sex' : undeclared identifier
    Error executing cl.exe.
    
    1.obj - 3 error(s), 0 warning(s)*/
    
    
    //调用stud1.set_data()函数时，实参出现不当类型：
    /*int main()  
    {  
        Student stud1,stud2;   
    	
        stud1.set_data(1,"He",'f');  
        stud2.set_data(x,"She",'m');  
        stud1.display();  
        stud2.display();  
        return 0;  
    }  
    --------------------Configuration: 1 - Win32 Debug--------------------
    Compiling...
    1.cpp
    C:\Documents and Settings\user\桌面\程序设计\1.cpp(31) : error C2065: 'x' : undeclared identifier
    Error executing cl.exe.
    
    1.obj - 1 error(s), 0 warning(s)*/