Tema SDA INcompleta

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

typedef enum{false, true}bool;
typedef enum{medii, superioare, doctorat}Studii;
typedef enum{econmic, tehnic}Doctorat;

typedef struct{
    unsigned short zi, luna, an;
}Date;

typedef struct {
    char nume[15], prenume[15];
    Date data;
    double salar;
    Studii  selector;
    union {
        struct
        {
            double mediaBac, mediaLiceu;
        }studMedi;
        double notaLicenta;
        Doctorat doctorat;
    };
}angajat;

int ReadAngajat(angajat *angajat) {
    int n = 0;
    FILE *f = fopen("in.txt","r");
    if (f == NULL)return false;
    while (!feof(f)) {
        if (7 != fscanf(f, "%s%s%hu%*c%hu%*c%hu%lf%d", angajat[n].nume, angajat[n].prenume, &angajat[n].data.zi, &angajat[n].data.luna, &angajat[n].data.an, &angajat[n].salar, &angajat[n].selector)) return n;
        switch (angajat[n].selector)
        {
            case 0:
                if (fscanf(f, "%lf%lf", &angajat[n].studMedi.mediaBac, &angajat[n].studMedi.mediaLiceu) != 2) return n;
                break;
            case 1:
                if (1 != fscanf(f, "%lf", &angajat[n].notaLicenta)) return n;
                break;
            case 2:
                if (1 != fscanf(f, "%d", &angajat[n].selector)) {
                    printf("\nDate introuduse gresit programul s-a oprit la persoana %d", n + 1);
                    return n;
                }
                break;
        default:
            printf("\nDate introuduse gresit programul s-a oprit la persoana %d", n + 1);
            return n;
            break;
        }
        n++;
        if (n == 20) return n;
    }
    return n;
}
void AfisareAngajat(angajat *angajat, int n) {
    int i;
    for (i = 0; i < n; i++) {
        printf("\nNume: %sPrenume: %sData Nasteri: %hu/%hu/%hu\nSalariu: %lf", angajat[n].nume, angajat[n].prenume, angajat[n].data.zi, angajat[n].data.luna, angajat[n].data.an, angajat[n].salar);
        switch (angajat[i].selector) {
        case 0:
            printf("\nAngajat cu studii medii:");
            printf("\nMedia Bac: %f\nMedia Liceu:%f", angajat[i].studMedi.mediaBac, angajat[i].studMedi.mediaLiceu);
            break;
        case 1:
            printf("\nAngajat cu studii superiare:");
            printf("Nota Licenta: %lf", angajat[i].notaLicenta);
            break;
        case 2:
            printf("\nAnjagat cu doctorat ");
            if (angajat[i].doctorat == 1)
                printf("tehnic");
            else
                printf("economic");
            break;
        }
    }
}
int main() {
    int n = 0;
    int opt;
    angajat angajat[20];
    do {
        printf("\n0.Iesire");
        printf("\n1.Citire date din fiser");
        printf("\n2.Afisare Date");
        printf("\nOptiunea dorita:");
        scanf("%d", &opt);

        switch (opt)
        {
        case 0: return 0;
        case 1:
            n = ReadAngajat(angajat);
            break;
        case 2:
            if (n) {
                AfisareAngajat(angajat, n);
                printf("\n In total sunt %d angajati", n);
            }
            else
                printf("\nNu sunt angajati in baza de date");
            break;
        default:
            break;
        }


    } while (1);
    system("pause");
    return 0;
}