https://github.com/triffon/oop-2019-20/tree/master/labs/5/Practice_01



#include<iostream>
using namespace std;

const unsigned short gradeCount = 5;

struct Student{
    unsigned long long EGN;
    char firstName[30];
    char lastName[30];
    unsigned facNum;
    double grades[5];

    void input() {
        cout<<"EGN:  ";
        cin>>EGN;
        cout<<"ime:  ";
        cin.get();
        cin.getline(firstName,29);
        cout<<"famil:  ";
        cin.getline(lastName,29);
        cout<<"FN:  ";
        cin>>facNum;
        cout<<"ocenki ("<<gradeCount<<" na broi): \n";
        for(int i=0; i<gradeCount; i++) {
            cin>>grades[i];
        }
    }

    void print() {
        cout<<firstName<<"  "<<lastName<<"  "<<EGN<<"  "<<facNum<<"  ";
        for(int i=0;i<gradeCount;i++) {
            cout<<grades[i];
        }
    }

    double avgGrade() {
        double sum=0;
        for(int i=0;i<gradeCount;i++) {
            sum+=grades[i];
        }
        return sum/gradeCount;
    }
};

void addStudent(Student studs[], unsigned short &countS) {
    cout<<endl<<"Info about student " << countS+1<< ": \n";
    studs[countS].input();
    countS++;
}

void printAllStudents(Student studs[], unsigned short countS) {
    cout<<endl;
    if(countS==0) {
        cout<<"nqma studenti v masiva";
        return;
    }
    for(unsigned short i=0; i<countS; i++) {
        studs[i].print();
        cout<<endl;
    }
}

void printMarch(Student studs[], unsigned short countS) {
    cout<<endl;
    if(countS==0) {
        cout<<"nqma studenti v masiva";
        return;
    }
    for(unsigned short i=0; i<countS; i++) {
        if(((studs[i].EGN/1000000)%10)==3) {
            cout<<studs[i].firstName<<"  "<<studs[i].lastName<<"  "<<studs[i].avgGrade();
        }
        cout<<endl;
    }
}

void avgGrades(Student studs[], unsigned short countS) {
    cout<<endl;
    if(countS==0) {
        cout<<"nqma studenti v masiva";
        return;
    }
    for(unsigned short i=0; i<countS; i++) {
        cout<<studs[i].avgGrade()<<endl;
    }
}

void maxAvgGrade(Student studs[], unsigned short countS) {
    cout<<endl;
    if(countS==0) {
        cout<<"nqma studenti v masiva";
        return;
    }
    double maxG=0;
    for(unsigned short i=0; i<countS; i++) {
        double currG = studs[i].avgGrade();
        if(maxG<currG) maxG=currG;
    }
    cout<<maxG;
}

int main() {
    const int MAX_STUD = 10;
    Student students[MAX_STUD];
    short unsigned studCount = 0;

    int menuind=1;
    while(menuind) {
        cout<<"\n\n0 - exit \n1 - add new student \n2 - output march bois \n3 - output highest average grade \n";
        cin>>menuind;
        switch(menuind) {
            case 1:
                addStudent(students,studCount);
                break;
            case 2:
                printMarch(students,studCount);
                break;
            case 3:
                maxAvgGrade(students,studCount);
                break;
        }
    }

    return 0;
}