Question

How can I make this compatible with older C++ compilers that DO NOT make use of stoi and to_string?

//Booking system

#include <iostream>
#include <iomanip>
#include <string>

using namespace std;

string welcome();
void print_seats(string flight[]);
void populate_seats();
bool validate_flight(string a);
bool validate_seat(string a, int b);
bool validate_book(string a);
void print_ticket(string passenger[], int i);

string flights [5][52];
string passengers [4][250];

int main(){
    string seat, flight, book = "y";
    int int_flight, p = 0, j = 0;
    int seat_number, seat_price;
    populate_seats();

    while (book == "y" || book == "Y"){
        passengers[p][0] = (welcome());

        cout << "\nThe available travel times for flights are:" << endl;
        cout << "    Depart\tArrive" << endl;

        for (int i = 0; i < 5; i++){
            if (flights[i][51] != "50"){
            cout << i + 1 << ". " << flights[i][0] << endl;
            }
            else if (j < 4){
                j++;
            }
            else{
                cout << "\nAll flights are booked" << endl;
                return 0;
            }
        }

        cout << "Choose the time by enetering the option number from the displayed list:" << endl;
        do{
            cin >> flight;
        }
        while(!validate_flight(flight));

        cout << "\nSelect your seat:" << endl;

        int_flight = stoi(flight) - 1;
        print_seats(flights[int_flight]);

        do{
            cin >> seat;
        }
        while (!validate_seat(seat, int_flight));

        for (int i = 0; i < 51; i++){
            if (flights[int_flight][i] == seat){
                flights[int_flight][i] = "**";
                seat_number = i;
                break;
            }
        }

        if (seat_number < 25){
            seat_price = 1920;
            passengers[p][4] = "First class";
        }
        else{
            seat_price = 1600;
            passengers[p][4] = "Economy class";
        }

        passengers[p][1] = flight;
        passengers[p][2] = seat;
        passengers[p][3] = to_string(seat_price);

        flights[int_flight][51] = to_string(stoi(flights[int_flight][51]) + 1);

        print_ticket(passengers[p], int_flight);

        cout << "\nWould you like to book another seat? Y/N: " ;
        do{
            cin >> book;
            cin.get();
        }while(!validate_book(book));

        p++;
        cout << endl;
        }

        for (int i = 0; i < 5; i++){
            cout << "Number of bookings made for " << flights[i][0].substr(0,5);
            cout << ": " << flights[i][51] << endl;
        }
    return 0;
}

string welcome(){
    string passenger;

    cout << "Welcome to the COS1511 Flight Booking System\n" << endl;
    cout << "Enter Full Name" << endl;

    getline(cin,passenger);

    return passenger;
}

void print_seats(string flight[]){
    int k = 0;
    cout << "First class(1920.00)" << endl;
    for (int j = 0; j < 9; j++){
        if (k == 24){
            cout << "Economy class(1600.00)" << endl;
        }
        cout << "|";
        for (int i = 0; i < 3; i++){
            cout << flight[k+1] << "|";
            k++;

                if (k > 49){
                    cout << endl;
                    return;
            }
        }

        cout << "----";

        for (int i = 0; i < 3; i++){
            cout << "|" << flight[k+1];
            k++;
        }
        cout << "|" << endl;
    }
}

void populate_seats(){
    flights[0][0] = "07:00\t09:30";
    flights[1][0] = "09:00\t11:30";
    flights[2][0] = "11:00\t13:30";
    flights[3][0] = "13:00\t15:30";
    flights[4][0] = "15:00\t17:30";

    for (int a = 0; a < 5; a++){
        int b = 0;
        for (int i = 17; i < 26; i++){
            for ( int j = 1; j < 7; j++){

                if (i == 25 && j > 2){
                    break;
                }
                string seat = char('0' + i) + to_string(j);
                flights[a][b+1] = seat;

                b++;
            }
            flights[a][b+1] = "0";
        }
    }
}

void print_ticket(string passenger[], int i){
    int name = passenger[0].length();
    cout << "Travel Ticket for Flight " << i + 1 << endl;
    cout << "----------------------------" << endl;

    cout << left << setw(15) << "Name " << ": " << passenger[0];
    cout << setw(13) << "" << "Travel Ticket Class " << ": " << passenger[4] << endl;

    cout << setw(31 + name) << "" << setw(20) << "Seat No." << ": " << passenger[2] << endl;

    cout << setw(15) << "Departure" << ": " << setw(13 + name) << "Johannesburg";
    cout << setw(20) << "Departure Time" << ": " << flights[i][0].substr(0,5) << endl;

    cout << setw(15) << "Destination" << ": " << setw(13 + name) << "Cape Town";
    cout << setw(20) << "Arrival Time" << ": " << flights[i][0].substr(6,10) << endl;

    cout << "\n----------------------------" << endl;
    cout << "Amount: R" << passenger[3] << endl;
    cout << "Thank you for booking with COS 1511 Booking System." << endl;
    cout << "Your travel agent is Damian Jacobs" << endl;
    cout << "----------------------------" << endl;
}

bool validate_flight(string a){
    for (int i = 1; i < 6; i++){
        if (a == to_string(i)){
            return true;
        }
    }
    cout << "Incorrect option! Please choose from 1-5." << endl;
    return false;
}

bool validate_seat(string a, int b){
    for (int i = 0; i < 51; i++){
        if (flights[b][i] == a){
            return true;
        }
    }
    cout << "Enter a valid seat" << endl;
    return false ;
}

bool validate_book(string a){
    while(a != "y" && a != "n" & a != "Y" && a != "N"){
        cout << "Enter a valid option: Y/N:";
        return false;
    }
    return true;
}

Answer 1

`Hey,

Note: Brother in case of any queries, just comment in box I would be very happy to assist all your queries

#include <iostream>
#include <iomanip>
#include <string>
#include <sstream>

using namespace std;

string to_strings(int seat_price)
{
ostringstream str11;
str11 << seat_price;
return str11.str();
}
int stois(string flight)
{
stringstream test(flight);
int nnom;
test>>nnom;
return nnom;
}
string welcome();
void print_seats(string flight[]);
void populate_seats();
bool validate_flight(string a);
bool validate_seat(string a, int b);
bool validate_book(string a);
void print_ticket(string passenger[], int i);

string flights [5][52];
string passengers [4][250];

int main(){
string seat, flight, book = "y";
int int_flight, p = 0, j = 0;
int seat_number, seat_price;
populate_seats();

while (book == "y" || book == "Y"){
passengers[p][0] = (welcome());

cout << "\nThe available travel times for flights are:" << endl;
cout << " Depart\tArrive" << endl;

for (int i = 0; i < 5; i++){
if (flights[i][51] != "50"){
cout << i + 1 << ". " << flights[i][0] << endl;
}
else if (j < 4){
j++;
}
else{
cout << "\nAll flights are booked" << endl;
return 0;
}
}

cout << "Choose the time by enetering the option number from the displayed list:" << endl;
do{
cin >> flight;
}
while(!validate_flight(flight));

cout << "\nSelect your seat:" << endl;

int_flight = stois(flight) - 1;
print_seats(flights[int_flight]);

do{
cin >> seat;
}
while (!validate_seat(seat, int_flight));

for (int i = 0; i < 51; i++){
if (flights[int_flight][i] == seat){
flights[int_flight][i] = "**";
seat_number = i;
break;
}
}

if (seat_number < 25){
seat_price = 1920;
passengers[p][4] = "First class";
}
else{
seat_price = 1600;
passengers[p][4] = "Economy class";
}

passengers[p][1] = flight;
passengers[p][2] = seat;

passengers[p][3] = to_strings(seat_price);

flights[int_flight][51] = to_strings(stois(flights[int_flight][51]) + 1);

print_ticket(passengers[p], int_flight);

cout << "\nWould you like to book another seat? Y/N: " ;
do{
cin >> book;
cin.get();
}while(!validate_book(book));

p++;
cout << endl;
}

for (int i = 0; i < 5; i++){
cout << "Number of bookings made for " << flights[i][0].substr(0,5);
cout << ": " << flights[i][51] << endl;
}
return 0;
}

string welcome(){
string passenger;

cout << "Welcome to the COS1511 Flight Booking System\n" << endl;
cout << "Enter Full Name" << endl;

getline(cin,passenger);

return passenger;
}

void print_seats(string flight[]){
int k = 0;
cout << "First class(1920.00)" << endl;
for (int j = 0; j < 9; j++){
if (k == 24){
cout << "Economy class(1600.00)" << endl;
}
cout << "|";
for (int i = 0; i < 3; i++){
cout << flight[k+1] << "|";
k++;

if (k > 49){
cout << endl;
return;
}
}

cout << "----";

for (int i = 0; i < 3; i++){
cout << "|" << flight[k+1];
k++;
}
cout << "|" << endl;
}
}

void populate_seats(){
flights[0][0] = "07:00\t09:30";
flights[1][0] = "09:00\t11:30";
flights[2][0] = "11:00\t13:30";
flights[3][0] = "13:00\t15:30";
flights[4][0] = "15:00\t17:30";

for (int a = 0; a < 5; a++){
int b = 0;
for (int i = 17; i < 26; i++){
for ( int j = 1; j < 7; j++){

if (i == 25 && j > 2){
break;
}
string seat = char('0' + i) + to_strings(j);
flights[a][b+1] = seat;

b++;
}
flights[a][b+1] = "0";
}
}
}

void print_ticket(string passenger[], int i){
int name = passenger[0].length();
cout << "Travel Ticket for Flight " << i + 1 << endl;
cout << "----------------------------" << endl;

cout << left << setw(15) << "Name " << ": " << passenger[0];
cout << setw(13) << "" << "Travel Ticket Class " << ": " << passenger[4] << endl;

cout << setw(31 + name) << "" << setw(20) << "Seat No." << ": " << passenger[2] << endl;

cout << setw(15) << "Departure" << ": " << setw(13 + name) << "Johannesburg";
cout << setw(20) << "Departure Time" << ": " << flights[i][0].substr(0,5) << endl;

cout << setw(15) << "Destination" << ": " << setw(13 + name) << "Cape Town";
cout << setw(20) << "Arrival Time" << ": " << flights[i][0].substr(6,10) << endl;

cout << "\n----------------------------" << endl;
cout << "Amount: R" << passenger[3] << endl;
cout << "Thank you for booking with COS 1511 Booking System." << endl;
cout << "Your travel agent is Damian Jacobs" << endl;
cout << "----------------------------" << endl;
}

bool validate_flight(string a){
for (int i = 1; i < 6; i++){
if (a == to_strings(i)){
return true;
}
}
cout << "Incorrect option! Please choose from 1-5." << endl;
return false;
}

bool validate_seat(string a, int b){
for (int i = 0; i < 51; i++){
if (flights[b][i] == a){
return true;
}
}
cout << "Enter a valid seat" << endl;
return false ;
}

bool validate_book(string a){
while(a != "y" && a != "n" & a != "Y" && a != "N"){
cout << "Enter a valid option: Y/N:";
return false;
}
return true;
}

Kindly revert for any queries

Thanks.