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

void citire_multime(int n, int*a)
{
    int i;
    for (i = 0; i < n; i++)
    {
        if (i % 2 == 0)
        {
            printf("a[%d]=", i + 1);
            scanf("%d", &a[i]);
        }
        else
            a[i] = a[i - 1] + 2;
    }
}

void afisare_multime(int n, int a[100])
{
    int i,k=1,aux,j;
    for(i=0;i<n-1;i++)
        for (j = i; j < n; j++)
        {
            if (a[i] > a[j])
            {
                aux = a[i];
                a[i] = a[j];
                a[j] = aux;
            }
        }
    for (i = 0; i < n; i++)
        printf("%d ", a[i]);
    printf("\n");
}

void stergere_element_plus_salvare_fisier(int *n, int a[100])
{
    int i;
    FILE *fis;
    fis = fopen("multime_noua.txt", "w+t");
    (*n)--;
    for (i = 0; i < *n; i++)
    {
        fprintf(fis, "%d ", a[i]);
    }
}
int main()
{
    int n,a[100];
    enum{iesire, citire, afisare, stergere}opt;
    printf("n= ");
    scanf("%d", &n);
    do {
        printf("0.Iesire\n");
        printf("1.Citire elementelor din multime\n");
        printf("2.Afisare in ordine crescatoare\n");
        printf("3.Stergere ultimul element + salvare in fisier\n");
        printf("opt= ");
        scanf("%d", &opt);
        switch (opt)
        {
        case iesire:exit(0);
            break;
        case citire:citire_multime(n, a);
            break;
        case afisare:afisare_multime(n, a);
            break;
        case stergere:stergere_element_plus_salvare_fisier(&n, a);
            break;
        default:printf("Eroare!");
            break;
        }
    } while (1);
    system("pause");
    return 0;
}