sus

#include <cstdlib>
#include <string>
#include <iostream>

using namespace std;

struct Subject {
    string name;
    unsigned short mark;
};

struct Student {
    string name;        // imya
    string subname;     // otchestvo
    string surname;     // familiya
    Subject session[5];
};

inline string maincraft(size_t s) {
    const static string PATTERN = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";
    string str;
    for (size_t i = 0; i < s; i++) {
        str += PATTERN[rand() % PATTERN.length()];
    }
    return str;
}

int main(int argc, char *argv[])
{
    string subjectNames[] = { "Q", "W", "E", "R", "Bratishkin stream" };
    std::cout << "Available subjects: (ID: Name)" << endl;
    for (size_t i = 0; i < 5; i++ ) {
        std::cout << i << ": " << subjectNames[i] << endl;
    }
    cout << endl;

    Student students[10];
    cout << "Student ID Name Surname Subname Subjects(,,,,)" << endl;
    for (size_t i = 0; i < 10; i++)
    {
        Student& s = students[i];
        s.name = maincraft(5);
        s.surname = maincraft(10);
        s.subname = maincraft(6);
        cout << "Student " << i
            << " " << s.name
            << " " << s.surname
            << " " << s.subname;

        for (size_t j = 0; j < 5; j++) {
            s.session[j].name = subjectNames[j];
            s.session[j].mark = rand() % 6;
            cout << " " << s.session[j].mark;
        }
        cout << endl;
    }

    size_t subjectIndex;
    std::cout << endl << "Enter subject ID: ";
    std::cin >> subjectIndex;

    unsigned int sum = 0;
    for (size_t i = 0; i < 10; i++) {
        Student& s = students[i];
        sum += s.session[subjectIndex].mark;
    }

    std::cout << "Average: " << sum / 10. << std::endl;

    return 0;
}