Все студенты со средним рейтингом, большим 4.0 Стек

#include <iostream>
#include <stack>
using namespace std;
struct Student {
    string name;
    string surname;
    string group;
    int born;
    double avsr;
    Student()=default;
    ~Student ()=default;
    Student(string n,string s,string g,int b,  double a):name(n),surname(s),group(g),born(b),avsr(a) {}
    Student(const Student &a):name(a.name),surname(a.surname),group(a.group),born(a.born),avsr(a.avsr) {}
    Student& operator=(const Student &a) {
        name=a.name;
        surname=a.surname;
        group=a.group;
        born=a.born;
        avsr=a.avsr;
    }
 
};
bool operator==(const Student &a, const Student &b) {  // необязательно 
    return a.avsr==b.avsr;
}
ostream& operator<<(ostream &os, const Student &a) {
    os<<a.name<<" "<<a.surname<<" "<<a.group<<" "<<a.born<<" "<<a.avsr<<endl;
    return os;
}
 
int main() {
    stack<Student> st;
    st.emplace(Student("s1mple","ss","grc-2213",1976,4.1));
    st.emplace(Student("flamie","sdss","grc-22",1980,3.0));
    st.emplace(Student("guard","vchg","n-2",1983,5));
    st.emplace(Student("fox","vtyty","tyt-233",1993,4.0));
    while(!st.empty()) {
        if(st.top().avsr>4.0) {
            cout<<st.top();
        }
        st.pop();
    }
    return 0;
}

st.push(Student("s1mple","ss","grc-2213",1976,4.1));