Funkcijos 2

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <iomanip>

using namespace std;
int p, bank = 5;
void meniu();
void bankas();
void loterija();
void uzkrauti();
void issaugoti();

ifstream fd("duom.txt");
ofstream fr("duom.txt");

int main()
{

    uzkrauti();
    meniu();

    return 0;
}

void uzkrauti(){
    fd >> bank;
}
void issaugoti(){
    fr << bank;
}

void bankas(){

    cout << endl << "Banko saskaitos balansas:" << setw(3) << bank << endl;
    meniu();


}

void loterija(){
    int lot;
    int skaicius = rand() % 10 + 1;
    if(bank != 0){
        cout << "Loterijos tikslas: Turite atspeti, ar skaicius didesnis nei 5 ar mazesnis" << endl;
        cout << "Pasirinkite:" << endl;
        cout << "1. Didesnis nei 5" << endl;
        cout << "2. Mazesnis nei 5" << endl;
        cin >> lot;

        if(lot == 1){
            if(5 < skaicius){
                cout << "Laimejote! Padvigubinote savo banka. Skaicius = " << skaicius << endl;
                bank*=2;
            }
            else{
                cout << "Pralaimejote! Jusu bankas sumazejo per puse. Skaicius = " << skaicius << endl;
                bank/=2;
            }
            meniu();

        }
        if(lot == 2){
            if(5 > skaicius){
                cout << "Laimejote! Padvigubinote savo banka. Skaicius = " << skaicius << endl;
                bank*=2;
            }
            else{
                cout << "Pralaimejote! Jusu bankas sumazejo per puse. Skaicius = " << skaicius << endl;
                bank/=2;
            }
            meniu();

        }
        else meniu();
    }
    else cout << "Nebeturite balanse kreditu ! " << endl; meniu();

}

void meniu(){
    cout << "Pasirinkite:" << endl;
    cout << "1. Isvalyti ekrana" << endl;
    cout << "2. Bankas" << endl;
    cout << "3. Loterija" << endl;
    cout << "Noredami iseiti is meniu - iveskite 0" << endl;

    cin >> p;
    if(p == 0) {issaugoti(); exit(0);}
    if(p == 1) {for(int i = 0; i < 100; i++) cout << endl; meniu();}
    if(p == 2) bankas();
    if(p == 3) loterija();

    else{ cout << "Klaidingai ivestas meniu punktas" << endl; meniu();}

}