afisare nr prime din lista

#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;

ifstream f("date.in");
ofstream g("date.out");

struct nod
{
    int info;
    nod *adr;
};

nod *prim;

int nrprim(int x)
{
    int i,ok=1;
    for (i=2;i<=sqrt(x);i++)
        if (x%i==0)
        ok=0;

    if (ok==1)
        return 1;// e prim
    return 0;// nu e prim
}

void creare()
{
    int n,i;
    nod *p,*nou;
    while (f>>n)
        if (prim==NULL)
    {
        prim=new nod;
        prim->info=n;
        p=prim;
    }
    else
    {
        nou=new nod;
        nou->info=n;
        p->adr=nou;
        p=nou;


    }
    p->adr=NULL;
}


void afis()
{
    nod *p=prim;
    while (p)
    {
        if((nrprim(p->info))==1)
        {g<<p->info<<" ";
        p=p->adr;}
    }
}



int main()
{
   creare();
   afis();
   return 0;
}