#include <stdio.h>
typedef struct list {
    char cod[20];
    double pret;
    enum{telefon, unitate, tableta}tip;
    struct list *urm;
}depozit;




int main()
{
    depozit *head = NULL;
    char cod[20];
    int opt, ok, i;
    do {
        printf("1. Introducere echipament nou\n");
        printf("2. Afisare lista\n");
        printf("3. Schimbare paritate bit\n");
        printf("4. Iesire\n");
        scanf("%d", &opt);
        switch (opt) {
        case 1:
            do{
                ok = 0;
                printf("Cod: "); scanf("%s", cod);
                if (cod[0] >= '0' && cod[0] <= '9' && cod[1] >= 'a' && cod[1] <= 'z' && cod[2] == '-') {
                    for (i = 3; cod[i] != 0; i++)if (cod[i] < '0' || cod[i] > '0') break;
                    if (cod[i] == 0) ok = 0;
                }

            } while (ok == 0);
            break;
        case 4: return 0;
        }
    } while (1);
}