C++ 中控制台代码运行时的分段错误

我正在尝试制作一个简单的控制台学生详细信息显示系统，其中有 2 个班级，班级学生(基类)具有名称和注册号的成员变量，班级学生运动员(派生类)与体育类型字符串。 代码编译成功，但在运行时仅询问学生详细信息，但不会像调用 identify() 函数时预期的那样显示详细信息。 在代码块上，错误可能不会显示，但在联机编译(例如 https://www.onlinegdb.com/online_c++_compiler)上，它显示代码中存在分段错误。 请在必要时提供帮助。

我的代码完全(整体)如下：

#include <iostream>
using namespace std;
/**Base class**/
class student
{
protected:
string studName, studRegNum;
public:
student(string stdName, string regNo);
/**To define friendly class that is
Common to both classes**/
friend void identify();
};
/**constructor for class student**/
student::student(string stdName, string regNo)
{
studName = stdName;
studRegNum = regNo;
}
/**Derived class**/
class studentAthlete : public student
{
private:
string member_sport;
public:
/**To create constructor for class studentAthlete within class**/
studentAthlete(string student_sport):student(studName, studRegNum)
{
member_sport = student_sport;
}
/**To define friendly class that is
Common to both classes**/
friend void identify();
};
/**To display student information**/
void identify()
{
studentAthlete sa(sa.member_sport);
cout<<"Student Name: "<<sa.studName<<endl;
cout<<"Student Registration Number: "<<sa.studRegNum<<endl;
cout<<"Student Sport: "<<sa.member_sport<<endl;
}
int main()
{
string StudentName, StudentRegistrationNo, StudentSport;
/**To get & set student name from user**/
cout<<"Enter student name: "<<endl;
cin>>StudentName;
/**To get & set Student Registration No from user**/
cout<<"Enter Student Registration No: "<<endl;
cin>>StudentRegistrationNo;
/**To get & set Student Sport from user**/
cout<<"Enter Student Sport: "<<endl;
cin>>StudentSport;
/**To pass student values to their respective constructors**/
student st(StudentName,StudentRegistrationNo);
studentAthlete sa(StudentSport);
/**To display student information**/
identify();
return 0;
}