#include <iostream>
#include <fstream>
#include <stdlib.h>
using namespace std;
struct student{
char nume[20],prenume[20],specializarea[20],telefon[20];
int an,matricol;
}s[100];
int n,opt;
ifstream f("studenti.txt");
void citire(student v[100],int &n)
{
    f>>n;
    for(int i=1;i<=n;i++)
    {
        f>>v[i].nume;
         f>>v[i].prenume;
          f>>v[i].matricol;
           f>>v[i].specializarea;
            f>>v[i].telefon;
             f>>v[i].an;
    }
}
void adaugare(student v[100],int &n)
{
    ofstream f("studenti.txt");
    n++;
    cout<<"Numele: ";cin>>v[n].nume;
    cout<<"Prenumele: ";cin>>v[n].prenume;
    cout<<"Matricol: ";cin>>v[n].matricol;
    cout<<"Specializarea: ";cin>>v[n].specializarea;
    cout<<"Telefon: ";cin>>v[n].telefon;
    cout<<"An: ";cin>>v[n].an;
    //scrierea in fisier
    f<<n<<endl;
    for(int i=1;i<=n;i++)
    {
        f<<v[i].nume<<endl;
        f<<v[i].prenume<<endl;
        f<<v[i].matricol<<endl;
        f<<v[i].specializarea<<endl;
        f<<v[i].telefon<<endl;
        f<<v[i].an<<endl;
    }
}
void afisare(student v[100],int n)
{
    for(int i=1;i<=n;i++)
    {
cout<<v[i].nume<<endl;
cout<<v[i].prenume<<endl;
cout<<v[i].matricol<<endl;
cout<<v[i].specializarea<<endl;
cout<<v[i].telefon<<endl;
cout<<v[i].an<<endl;
cout<<endl;
    }
}
void stergere(student v[100],int &n)
{
    int nr,i,poz;
    cout<<"Introduceti numarul matricol al studentului: ";
    cin>>nr;
    for(i=1;i<=n;i++)
        if(nr==v[i].matricol)poz=i;
    if(poz>n)cout<<"Nu exista numarul matricol!"<<endl<<endl;
    else
    {
        for(i=poz;i<n;i++)
            v[i]=v[i+1];
        n=n-1;
        cout<<"Studentul a fost sters."<<endl<<endl;
        //scrierea in fisier
        ofstream f("studenti.txt");
        f<<n<<endl;
        for(int i=1;i<=n;i++)
        {
           f<<v[i].nume<<endl;
        f<<v[i].prenume<<endl;
        f<<v[i].matricol<<endl;
        f<<v[i].specializarea<<endl;
        f<<v[i].telefon<<endl;
        f<<v[i].an<<endl;
        }
    }
}
int main()
{citire(s,n);
f.close();
while(opt!=5)
{
    system("cls");
    cout<<endl<<"Facultatea de Matematica"<<endl<<endl;
    cout<<"1.Afisare studenti"<<endl;
    cout<<"2.Adaugare studenti"<<endl;
    cout<<"3.Stergere studenti"<<endl;
    cout<<"4.Modificare date student"<<endl;
    cout<<"5.Iesire"<<endl;
    cout<<"Introduceti optiunea: "<<endl;
    cin>>opt;
    switch(opt)
    {
        case 1:{system("cls");
    cout<<("Afisarea studentilor")<<endl<<endl;
    afisare(s,n);
    break;
        }
        case 2:{system("cls");
    cout<<("Adaugarea unui student")<<endl<<endl;
    adaugare(s,n);
    break;
        }
       case 3:{system("cls");
    cout<<("Stergerea unui student")<<endl<<endl;
    stergere(s,n);
    break;
       }
       case 4:{system("cls");
       cout<<"Modificare date"<<endl<<endl;
       cout<<"Introduceti un numar matricol";
       int nr.matricol;
       cin>>nr.matricol;
       while(opt1!=7)
       {
          cout<<"1.Nume: "<<endl;
           cout<<"2.Prenume: "<<endl;
            cout<<"3.Nr.Matricol: "<<endl;
             cout<<"4.Specializare: "<<endl;
              cout<<"5.Telefon: "<<endl;
               cout<<"6.An: "<<endl;
                cout<<"7.Iesire: "<<endl;
                 cout<<"Introduceti optiunea: ";
         cin>>opt1;
       }
       switch(opt1)
       {
           case 1:
       }
       }
    }
}

    return 0;
}