2.4

#include<string>
using namespace std;
class student
{
public:
void display();
int num;
string name;
char sex;

};
#include<iostream>
#include"student.h"
void student::display()
{
cout<<"num:"<<num<<endl;
cout<<"name:"<<name<<endl;
cout<<"sex:"<<sex<<endl;
}


//main.cpp
#include <iostream>
#include"student.h"

int main() 
{
student stud;
cin>>stud.num>>stud.name>>stud.sex;
stud.display();
return 0;
}