问我想按分数显示前3名学生，但它显示的是堆栈的前3名。

EN

#include <iostream>
#include <string>

using namespace std;

static std::size_t sizeOfStack { 0 };

class Student
{
public:
    string name;
    int marks;
    Student* nextStudent;

    void setName( string setn )
    {
        name = setn;
    }

    string getName( )
    {
        return name;
    }

    void setMarks( int setm )
    {
        marks = setm;
    }

    int getMarks( )
    {
        return marks;
    }

    void setNextStudent( Student* setAddress )
    {
        nextStudent = setAddress;
    }

    Student* getNextStudent()
    {
        return nextStudent;
    }
};

class Stack
{
public:
    Student* headStudent { NULL };

    bool isEmpty( )
    {
        if ( headStudent == NULL )
        {
            cout << '\n' << "Stack is Empty" << '\n';
            return true;
        }
        else
        {
            return false;
        }
    }

    void push( )
    {
        string studentName;
        int marks;
        Student* newNode = new Student;
        cout << "Enter the name of Student: " << '\n';
        cin >> studentName;
        newNode->setName( studentName );
        cout << "Enter the Marks of Student: " << '\n';
        cin >> marks;
        newNode->setMarks( marks );
        newNode->setNextStudent( NULL );
        if ( headStudent == NULL )
        {
            headStudent = newNode;
        }
        else
        {
            Student* ptr = headStudent;
            while ( ptr->getNextStudent( ) != NULL )
            {
                ptr = ptr->getNextStudent();
            }
            ptr->setNextStudent( newNode );
        }

        cout << '\n' << "Student Data saved successfully" << '\n';
        ++sizeOfStack;
    }

    void pop( )
    {
        if ( !isEmpty( ) )
        {
            Student* pre = headStudent;
            Student* ptr = headStudent;
            while ( ptr->getNextStudent() != NULL )
            {
                pre = ptr;
                ptr = ptr->getNextStudent( );
            }
            if ( ptr == headStudent )
            {
                headStudent = NULL;
            }
            else
            {
                pre->setNextStudent( NULL );
            }
            delete ptr;
            --sizeOfStack;
            cout << '\n' << "Student Data Remove Successfully from database" << '\n';
        }
    }

    void display( )
    {
        if ( !isEmpty( ) )
        {
            string studentNames[ sizeOfStack ] { };
            int studentMarks[ sizeOfStack ] { };
            int i { };
            int j { };
            cout << "*************************" << '\n';
            cout << "The Data of All students: " << '\n';
            cout << "Name\t\tMarks"<< '\n';
            Student* ptr = headStudent;
            while ( ptr != NULL )
            {
                studentNames[i++] = ptr->getName( );
                studentMarks[j++] = ptr->getMarks( );
                ptr = ptr->getNextStudent( );
            }
            for ( std::size_t idx = sizeOfStack - 1; idx >= 0; --idx )
            {
                cout<< studentNames[ idx ] << "\t\t" << studentMarks[ idx ] <<'\n';
            }
            cout << "*************************" << '\n';
        }
    }

    void shortStack( )
    {
        for ( std::size_t i = 0; i < sizeOfStack; ++i )
        {
            Student* ptr = headStudent;

            for ( std::size_t j = 0; j < sizeOfStack - 1; ++j )
            {
                string tmp;
                if ( ptr->getMarks( ) < ptr->getNextStudent( )->getMarks( ) )
                {
                    // ptr->setMarks(ptr->getMarks() + ptr->getNextStudent()  );
                    // some statement Goes here
                }
                ptr = ptr->getNextStudent( );
            }
        }
    }

    void top( )
    {
        if ( !isEmpty( ) )
        {
            // shortStack();
            cout << "\n\n" << "Top Positions:" << '\n';
            cout << '\n' << "Name\t\tMarks";
            Student* ptr = headStudent;

            for( std::size_t idx = 0; idx < 3; ++idx )
            {
                cout << '\n' << ptr->getName( ) << "\t\t" << ptr->getMarks( );
                ptr = ptr->getNextStudent( );
            }

            cout << "\n\n";
        }
    }
};


int main( )
{
    Stack s;

    while ( true )
    {
        int choice { };
        cout << '\n' << "*************************************************" << '\n';
        cout << "1. To Add a student in the stack" << '\n';
        cout << "2. To Remove a student from stack" << '\n';
        cout << "3. Display all students of stack" << '\n';
        cout << "4. Display top 3 students of stack" << '\n';
        cout << "5. Press 5 or any other key to close the program" << '\n';
        cout << "*************************************************" << '\n';
        cout << "Enter your choice (1, 2, 3, 4, 5):" << '\n';
        cin >> choice;

        switch ( choice )
        {
            case 1:
                s.push( );
                break;
            case 2:
                s.pop( );
                break;
            case 3:
                s.display( );
                break;
            case 4:
                s.top( );
                break;
            default:
                exit( 0 );
                break;
        }
    }

    return 0;
}