#include <iostream>
#include <string.h>

using namespace std;

class student{
private:
    int fnum;
    char name[40];
    double grade;
public:

    student(){fnum = 0; grade = 0; name[0] = 0;};
    student(int FacNum, const char *nName, double gGrade);
    student(student &p);
    ~student();
    void setFNum(int fNum);
    int getFNum();
    void setName(const char *Name);
    char* getName();
    void setGrade(double Grade);
    double getGrade();
    void changeSt();
    void print();
};

student::student(int FacNum, const char *nName, double gGrade){
    fnum = FacNum;
    strcpy(name, nName);
    grade = gGrade;
}

student::student(student &p){
    fnum = p.fnum;
    strcpy(name, p.name);
    grade = p.grade;
}

student::~student(){}

void student::setFNum(int fNum){
    fnum = fNum;
}

int student::getFNum(){
    return fnum;
}



void student::setName(const char *Name){
    strcpy(name, Name);
}

char* student::getName(){
    return name;
}



void student::setGrade(double Grade){
    grade = Grade;
}

double student::getGrade(){
    return grade;
}



void student::changeSt(){
    int fNum = 0;
    int nName = 1;
    int gGrade = 2;
    int command;

    do{
    cout << "Change: fnum - 0, name - 1, grade - 2, exit - 3" << endl;
    cin >> command;

    if(command == fNum){
        cout << "Enter fnum: ";
        cin >> fnum;

    }
    if(command == nName){
        cout << "Enter a name: ";
        cin >> name;
    }
    if(command == gGrade){
        cout << "Enter a grade: ";
        cin >> grade;
    }

  }while(command != 3);

}

void student::print(){
    cout << fnum << endl;
    cout << name << endl;
    cout << grade << endl;
}

class group{
private:
    student stud[30];

    public:
        void maxGradeStud(int studNum);
        void minGradeStud(int studNum);
        void avgGrade(int studNum);
        void printStudByFnum(int fNum, int studNum);
        void sortByFNum(int studNum);
        void sortByGrade(int studNum);
        void printAllStud(int studNum);
        void setGroup(int studNum);


};



void group::setGroup(int studNum){
    int fNum;
    char nName[40];
    double gGrade;


    for(int i = 0; i < studNum; i++){
        cout << "Enter student parameters: " << endl;
        cin >> fNum >> nName >> gGrade;
        stud[i] = student(fNum, nName, gGrade);
    }
}

void group::avgGrade(int studNum){
    double avg;
    double sum = 0;

    for(int i = 0; i < studNum; i++){
        sum += stud[i].getGrade();
    }
    avg = sum / studNum;

    cout.precision(3);
    cout << "The average grade of the group is: " << avg << endl;
}

void group::minGradeStud(int studNum){
    int storeMinInd;
    double minGrade = INT_MAX;
    for(int i = 0; i < studNum; i++){

        if(stud[i].getGrade() < minGrade){
                minGrade = stud[i].getGrade();
                storeMinInd = i;

        }
    }

    cout.precision(3);
    cout << "The student with the lowest grade is: ";
    stud[storeMinInd].print();

}

void group::maxGradeStud(int studNum){
    int storeMaxInd;
    double maxGrade = INT_MIN;
    for(int i = 0; i < studNum; i++){

        if(stud[i].getGrade() > maxGrade){
                maxGrade = stud[i].getGrade();
                storeMaxInd = i;

        }
    }

    cout.precision(3);
    cout << "The student with the highest grade is: ";
    stud[storeMaxInd].print();

}

void group::printStudByFnum(int fNum, int studNum){
    int storeFNum;
    for(int i = 0; i < studNum; i++){
        if(stud[i].getFNum() == fNum){
            storeFNum = i;
        }
    }
    cout << stud[storeFNum].getName() << endl;

}

void group::sortByFNum(int studNum){
    student temp;
    for(int i = 0; i < studNum; i++){
        for(int j = 0; j < studNum-1; j++){
            if(stud[j].getFNum() > stud[j+1].getFNum()){
                temp = stud[j];
                stud[j] = stud[j+1];
                stud[j+1] = temp;
            }
        }
    }
    cout << "List of the group sorted by fnum: " << endl;
    for(int i = 0; i < studNum; i++){
        stud[i].print();
    }
}

void group::sortByGrade(int studNum){
    student temp;
    for(int i = 0; i < studNum; i++){
        for(int j = 0; j < studNum-1; j++){
            if(stud[j].getGrade() > stud[j+1].getGrade()){
                temp = stud[j];
                stud[j] = stud[j+1];
                stud[j+1] = temp;
            }
        }
    }
    cout << "List of the group sorted by grade: " << endl;
    for(int i = 0; i < studNum; i++){
        stud[i].print();
    }
}

void group::printAllStud(int studNum){
    for(int i = 0; i < studNum; i++){
        stud[i].print();
    }
}




int main()
{
    int numStud = 3;
    student st;
    group stud;
    stud.setGroup(numStud);
    stud.avgGrade(numStud);
    stud.maxGradeStud(numStud);
    stud.sortByFNum(numStud);




    return 0;
}