#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <conio.h>
#define CURYEAR 2017
#define CURMONTH 12
#define CURDAY 18
#define SIZENAME 30
#define COUNTOFSUBJECTS 7
#define COUNTOFSTUDENTS 10

struct DataBirth {
    int iDay, iMonth, iYear;
};

struct Student {
    char cSurname[SIZENAME];
    char cName[SIZENAME];
    struct DataBirth SStudentBirthday;
    int iMarks[COUNTOFSUBJECTS];
    double AverageMark;
    int Age;
};
void ReadStudentInfo(FILE* Info, struct Student Group[]) {
    int i = 0, iSum = 0;
    double dbAverage = 0;
    while (!feof(Info)) {
        if ((fscanf(Info, "%s %s %d %d %d", &Group[i].cSurname, &Group[i].cName,
            &Group[i].SStudentBirthday.iDay, &Group[i].SStudentBirthday.iMonth,
            &Group[i].SStudentBirthday.iYear)) > 0) {
            for (int j = 0; j < COUNTOFSUBJECTS; j++) {
                fscanf(Info, "%d", &(Group[i].iMarks[j]));
                iSum += (Group[i].iMarks[j]);
            }
            dbAverage /= COUNTOFSUBJECTS;
            Group[i].AverageMark = dbAverage;
            i++;
        }
    }
}
double FindTheAverageAge(struct Student Group[]) {
    int iSum = 0, i;
    double dbAverageAge;
    for (i = 0; i < COUNTOFSTUDENTS; i++) {
        Group[i].Age = CURYEAR - Group[i].SStudentBirthday.iYear;
        if (((Group[i].SStudentBirthday.iMonth > CURMONTH)
            || (Group[i].SStudentBirthday.iMonth == CURMONTH))
            && (Group[i].SStudentBirthday.iDay > CURDAY)) {
            Group[i].Age--;
        }
        i++;
    }
    for (i = 0; i < COUNTOFSTUDENTS; i++) {
        iSum += Group[i].Age;
    }
    dbAverageAge = iSum / COUNTOFSTUDENTS;
    return dbAverageAge;
}
void Swap(struct Student Group[], int Pos1, int Pos2) {
    struct Student Temp;
    Temp = Group[Pos1];
    Group[Pos1] = Group[Pos2];
    Group[Pos2] = Temp;
}
void SortingByAverageMark(struct Student Group[]) {
    int j;
    for (int i = 1; i < COUNTOFSTUDENTS; i++)
    {
        for (j = i; j >= 0 && Group[j - 1].AverageMark > Group[j].AverageMark; j--)
        {
            Swap(Group, j - 1, j);
        }
    }
}
int FindTheCountOfStudentByAvrgAge(struct Student Group[], double dbAverageAge) {
    int i, iCount = 0;
    for (i = 0; i < COUNTOFSTUDENTS; i++) {
        if (Group[i].Age > dbAverageAge) {
            iCount++;
        }
    }
    return iCount;
}
void PrintStudent(FILE* Out, struct Student *SB) {
    fprintf(Out, "%10s %10s %2d %2d %4d", SB->cSurname, SB->cName,
        (SB->SStudentBirthday.iDay), (SB->SStudentBirthday.iMonth),
        (SB->SStudentBirthday.iYear));
    for (int i = 0; i < COUNTOFSUBJECTS; i++) {
        fprintf(Out, " %d ", (SB->iMarks[i]));
    }
    fprintf(Out, " %0.1lfn", SB->AverageMark);
}
void main(void) {
    struct Student Group[COUNTOFSTUDENTS];
    double dbAverageAge;
    int i, iCount;
    FILE* Info = fopen("studentinfo.txt", "r");
    FILE* Output = fopen("output.txt", "w");
    SortingByAverageMark(Group);
    dbAverageAge = FindTheAverageAge(Group);
    iCount = FindTheCountOfStudentByAvrgAge(Group, dbAverageAge);
    for (i = 0; i < iCount; i++) {
        PrintStudent(Output, Group);
    }
    fclose(Info); //!!!
    fclose(Output);
}