Code:

#include <iostream>
#include <string>
#include <iomanip>
#include <fstream>
using namespace std;
int main() {
    int br;
    char ime_radnika[br][13];
    char prezime_radnika[br][20];
    int staz[br];   float placa[br];
    cout<<"Zelite li izmjeniti uneseno ili unijeti novo?"<<endl;
    cout<<"1. Novo"<<endl;
    cout<<"2. Izmjeniti"<<endl;
    cout<<"-> ";
    int choice;
    cin>>choice;
    if(choice==2) {
                  char vatfajl[20];             //OVO NEMA NIKAKVE FUNKCIJE
                cout<<"Upisi ime fajla kojeg ocesh otvoriti : ";
                  cin>>vatfajl;
                  ifstream izlaznitok(vatfajl);
                  if(!izlaznitok) {
                                  cout<<"Ne mogu otvoriti fajl!! "<<vatfajl<<endl;
                                  cin.get();
                                  }
                                   }
                                  
    if(choice==1) {
    cout<<"------------------------------------"<<endl;
    cout<<"BROJ RADNIKA: ";
    cin>>br;
    static float uk_placa=0;
    for(int i=0;i<br;i++)
    {
            cout<<endl<<i+1<<". radnik IME: ";
            cin>>ime_radnika[i];
            cout<<endl<<i+1<<". radnik PREZIME: ";
            cin>>prezime_radnika[i];
            cout<<endl<<i+1<<". radnik STAZ: ";
            cin>>staz[i];
            cout<<endl<<i+1<<". radnik PLACA: ";
            cin>>placa[i];
            uk_placa=uk_placa+placa[i];
            cout<<"------------------------------------"<<endl; }
            char g;
            cout<<"Zapisati informacije u fajl?"<<endl<<"y/n"<<endl;
            cin>>g;
            if(g=='y')
            {
                      char *love=("kn");  
                      char b[30];
                      cout<<"Ime fajla: ";
                      cin>>b;
                      ofstream ulaznitok(b);
                      for(int n=0; n<br;n++) {
                        ulaznitok<<endl<<n+1<<". radnik IME: ";
            ulaznitok<<ime_radnika[n];
            ulaznitok<<endl<<n+1<<". radnik PREZIME: ";
            ulaznitok<<prezime_radnika[n];
            ulaznitok<<endl<<n+1<<". radnik STAZ: ";
            ulaznitok<<staz[n];
            ulaznitok<<endl<<n+1<<". radnik PLACA: ";
            ulaznitok<<placa[n]<<" "<<love;
            ulaznitok<<endl<<"------------------------------------";  
            }
              ulaznitok<<endl<<"Ukupna placa koju morash dati radnicima je "<<uk_placa<<" kn";
              cout<<"Zapishano u fajl!";
            fflush(stdin);
            cin.get();
            }
}
}