#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct student
{
    char name[100];
    char scname[100];
    char o[100];
    int gr;
    int mark[5];
};


struct student group[100];

int main()
{
    FILE * file = fopen("in.txt", "r");

    int i = 0;
	while (fscanf (file, "%s%s%s%d%d%d%d%d%d", group[i].name, group[i].scname, group[i].o,
                 &(group[i].gr), &(group[i].mark[0]),
                 &(group[i].mark[1]), &(group[i].mark[2]),
                  &(group[i].mark[3]),  &(group[i].mark[4])) != EOF) {
		i++;
	}

	for (int j = 0; j <  i; j++){
        printf("Student #%d: %s %s %s\n", j + 1, group[j].scname, group[j].name, group[j].o);
        printf("Group: %d\nMarks: ", group[j].gr);
        float s = 0;
        for (int q = 0; q< 5; q++){
            printf("%d ", group[j].mark[q]);
            s += group[j].mark[q];
        }
        printf("\nAverage: %f\n", s / 5.0);
	}

	int f;
	printf("\nEnter number of a student, or -1 to exit: ");
    scanf("%d", &f);
	while (f != -1){
        if (f > 0 && f <= i){
            f--;
            printf("Student: %s %s %s\n", group[f].scname, group[f].name, group[f].o);
            printf("Group: %d\nMarks: ", group[f].gr);
            float s = 0;
            for (int q = 0; q< 5; q++){
                printf("%d ", group[f].mark[q]);
                s += group[f].mark[q];
            }
            printf("\nAverage: %f\n", s / 5.0);
        } else{
            printf("Error\n");
        }

        printf("Enter number of a student, or -1 to exit: ");
        scanf("%d", &f);
	}

    return 0;
}