5_11_17_Task3-4

#include <iostream>
using namespace std;

struct Student {
public:
    char FIO[512];
    int mark[6];
    double middleMark() {
        double r = 0;
        for (int i = 0; i < 6; i++) {
            r = r + mark[i];
        }
        return r/6;
    }
    bool goneAway() {
        bool r = 0;
        int schet_dolgov = 0;
        for (int i = 0; i < 6; i++) {
            if (mark[i] <= 2) schet_dolgov++;
        }
        if (schet_dolgov >= 3) r = 1;
        return r;
    }
    bool grantEarned() {
        bool r = 1;
        for (int i = 0; i < 6; i++) {
            if (mark[i] <= 3) r = 0;
        }
        return r;
    }

}student[10000];

double middleClassMark(int n, Student ar[]){
    for(int i = 0; i < n - 1; i++){
        for(int j = i + 1; j < n; j++){
            if(ar[i].middleMark() > ar[j].middleMark()) swap(ar[i], ar[j]);
        }
    }
    double r = 0;
    for(int i = 2; i < n - 2; i++){
        r = r + ar[i].middleMark();
    }
    return r/(n-4);
}

int awayGoers(int n, Student ar[]){
    int r = 0;
    for(int i = 0; i < n; i++){
        if(ar[i].goneAway()) r++;
    }
    return r;
}

int grantGetters(int n, Student ar[]){
    int r = 0;
    for(int i = 0; i < n; i++)if(ar[i].grantEarned() == 1) r++;
    return r;
}

int dutiers(int n, Student ar[]){
    int r = 0;
    for(int i = 0; i < n; i++){
        bool dolgnik = 0;
        for(int j = 0; j < 6; j++) if(ar[i].mark[j] <= 2) dolgnik = 1;
        if(dolgnik) r++;
    }
    return r;
}

int main() {
    int n;
    cout << "Type students quantity\n";
    cin >> n;
    for(int i = 0; i<n; i++) {
        cout << "Type the marks of " << i+1 << " student(break with space)\n";
        for(int j = 0; j < 6; j++) cin >> student[i].mark[j];
        cout << "Type the students' lastnname. Type the dot at the end.\n";
        int j = 0;
        do{
            cin >> student[i].FIO[j];
            j++;
        }while(student[i].FIO[j-1] != '.');
        cout << student[i].middleMark() << ";\n";
        int dutyCounter = 0;
        for(int j = 0; j < 6; j++){

            if(student[i].mark[j] <= 2) dutyCounter++;
        }
        if(student[i].goneAway()){cout << " has gone away\n";}
        else if(dutyCounter == 1)cout << " has duty\n";
        else if(student[i].grantEarned()){cout << " has grant for education\n";}
    }
    cout << "Middle class mark is " << middleClassMark(n, student) << "; There are " << dutiers(n, student) << " dutiers in the class; " << awayGoers(n, student) << " had gone away; " << grantGetters(n, student) << " have grants for education";
    return 0;
}