c++ - 我正在尝试在C++上做傻瓜练习，但遇到错误，说 'GraduateStudent'类没有名为 'advisor'的任何字段

Question

在尝试创建两个类并使用它时，我遇到一个错误，说我的“GraduateStudent类”没有对象的任何名为“advisor”的字段，其代码如下:请帮我解决它谢谢
该程序演示了两个对象的创建和使用，一个类为Student类，第二个为GraduateStudent。该程序的输出如下:

constructing student Cy N
6
Sense constructing student Matt Madox 
constructing graduate student Matt Madox
2
adding grade to Cy N Sense
adding grade to Matt Madox Matt’s qualifier grade = 1.5
Press any key to continue . . . 

码:

//inheritanceexample
#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <strings.h>

using namespace std;
// Advisor empty class

class Advisor{};
class Student
{
public:
Student((char* pName="no name")
    :   average(0.0), SemesterHours(0)
{
strncpy(name, pName, MAXNAMESIZE);
name[MAXNAMESIZE -1] = '\0';
cout << "constructing object"
 << name
 << endl;
}
 void addcourse(int Hours, float grade) 
 {
cout << "adding grade to " << name << average << endl;
average = ( SemesterHours * average + grade );
SemesterHours +=Hours;
average = average / SemesterHours; 
}
int hours(){return SemesterHours;}
float gpa(){return average;}
}

void addCourse(int hours, float grade)
{
cout << "adding grade to " << name << average << endl;
average = ( SemesterHours * average + grade );
SemesterHours +=Hours;
average = average / SemesterHours; 
}
int hours(){return SemesterHours;}
int gpa(){return average;} 
protected:
char name[MAXNAMESIZE];
 int SemesterHours;
 float average; 

};
// my sublass

class GraduateStudent : public Student
{
public:
GraduateStudent(char  *pName, Advisor &adv, float qG = 0.0) : Student(pName), advisor(adv), qualifierGrade(qG)
{
advisor;
        float qualifiergrade;       
        cout<< "constructing graduate students"
            <<pName
            <<endl;
}
};

int main(int nNumberofargs, char* PSZArgs[])
{
Advisor advisor;
// create two objects

Student llu("Cy N Sense");
GraduateStudent gs("Matt Madox", advisor, 1.5);
llu.addCourse(3, 2.5); gs.addCourse(3, 3.0);
// display the graduate student’s qualifier grade

    cout << "Matt’s qualifier grade = "
<< gs.qualifier() 
<< endl; 
cout << "Matt’s qualifier grade = "
 << gs.qualifier()
 << endl;
// wait until user is ready before terminating program 

syestem("PAUSE")
return 0;

};

Answer 1

“类'GraduateStudent'没有名为'advisor'的字段”

没错，您的类(class)(学生和研究生)都没有名为顾问的成员变量。

也许这段代码:

class GraduateStudent : public Student
{
public:
GraduateStudent(char  *pName, Advisor &adv, float qG = 0.0) : Student(pName), advisor(adv), qualifierGrade(qG)
{
advisor;
        float qualifiergrade;       
        cout<< "constructing graduate students"
            <<pName
            <<endl;
}
};

搞砸了，你想写这个:

class GraduateStudent : public Student
{
public:
Advisor advisor;
float qualifiergrade;    
GraduateStudent(char  *pName, Advisor &adv, float qG = 0.0) : Student(pName), advisor(adv), qualifierGrade(qG)
{

        cout<< "constructing graduate students"
            <<pName
            <<endl;
}
};