liste.cpp

#include <iostream>

using namespace std;

struct elev {
    char nume[20];
    float medie;
    struct elev *urm;
};

struct elev *start=0, *stop=0;

void insersare(char n[20], float m) {
    struct elev *nod = new struct elev;
    nod->medie = m;
    strcpy(nod->nume, n);
    nod->urm = 0;
    if(start == NULL) {
        start = stop = nod;
        return;
    }
    else {
        stop->urm = nod;
        stop = nod;
        return;
    }
}

void afisare() {
    struct elev *p = start;
    while (p!=0) {
        cout << p->nume << ' ' << p->medie << endl;
        p=p->urm;
    }
    return;
}

float mediaClasei() {
    // parcurge toata lista
    // returneaza media clasei

    struct elev *p = start;
    float medie = 0;
    int k = 0;
    while (p)
    {
        medie += p->medie;
        k++;
        p = p-> urm;
    }
    return medie / k;
}

float sumaclasa (struct elev* a)
{
    if (!a)
        return 0;
    else
        return a->medie +sumaclasa(a->urm);

}

void stergere (char a[20])
{
   struct elev * b , *aux, *ant;
   ant = b = start;
   while (b) {
       if (strcmp(b->nume, a) == 0)
       {
           if (start == b)
           {
               aux = start;
               start = start->urm;
               delete aux;
           }
           else if (stop == b)
           {
               ant->urm=0;
               stop=ant;
               delete b;
               return;
           }
           else {
               aux=b;
               ant->urm=b->urm;
               delete aux;
           }
           b=ant;
       }
       ant=b;
       b=b->urm;
   }
}
int main() {
    insersare("andrei", 8.55);
    insersare("alex", 12.00);
    insersare("Bogdan" , 6.52);
    insersare("Catalin" , 8.64);
    stergere("Catalin");
    afisare();
    cout<<sumaclasa(start);
    return 0;
}