Please check and fix my C++ program. I don't know why my output is different with the expected output.

Here is my program or coding:

#include
#include
#include
using namespace std;

// Function prototypes
void welcome();
void displayMenu();
void readOption(int &option);
void readInt(string prompt, int &num);
void readDouble(string prompt, double &num);
void placeOrder(double &cost);
double tipDiscount(double &tip, double &discount, double cost);

int main() {
   welcome();

   int option;
   do {
       displayMenu();
       readOption(option);

       if (option == 1) {
           double totalCost = 0.0;
           placeOrder(totalCost);

           double tip, discount;
           double finalTotal = tipDiscount(tip, discount, totalCost);

           cout << fixed << setprecision(2);
           cout << "\nYour final total is: $" << finalTotal << endl;
           if (discount > 0.0) {
               cout << "You get a " << (discount == 0.10 ? "10%" : "5%") << " discount!" << endl;
               cout << "Your discount is $" << discount << endl;
           }
           cout << "Your total after tip and discount is: $" << finalTotal - discount << endl;
       } else if (option != 2) {
           cout << "Invalid Option! Please choose 1 or 2!" << endl;
       }

   } while (option != 2);

   cout << "\nThank you for using my program!\n";
   return 0;
}

// Function implementations
void welcome() {
   cout << "Welcome to my Food Cart Program!\n";
}

void displayMenu() {
   cout << "\nWhat would you like to do today?\n";
   cout << "Pick an option from below:\n";
   cout << "1. Place an order\n";
   cout << "2. Quit\n";
}

void readOption(int &option) {
   do {
       readInt(">> ", option);
       if (option != 1 && option != 2) {
           cout << "Invalid Option! Please choose 1 or 2!\n";
       }
   } while (option != 1 && option != 2);
}

void readInt(string prompt, int &num) {
   cout << prompt;
   cin >> num;
   while (!cin || num < 1 || num > 2) {
       cout << "Invalid Optione! Please choose 1 or 2: ";
       cin.clear();
       cin.ignore(100, '\n');
       cin >> num;
   }
   cin.ignore(10, '\n');
}

void readDouble(string prompt, double &num) {
   cout << prompt;
   cin >> num;
   while (!cin || num < 0.0) {
       cout << "Invalid data! Please enter a non-negative number: ";
       cin.clear();
       cin.ignore(100, '\n');
       cin >> num;
   }
   cin.ignore(10, '\n');
}

void placeOrder(double &cost) {
   char anotherItem;
   do {
       string itemName;
       double itemCost;

       cout << "Enter the name of your item: ";
       getline(cin, itemName);
       readDouble("Enter the cost of your item $: ", itemCost);

       cost += itemCost;

       do {
           cout << "Do you want another item? (y/n): ";
           cin >> anotherItem;
           cin.ignore(10, '\n');

           if (tolower(anotherItem) != 'y' && tolower(anotherItem) != 'n') {
               cout << "Invalid Option! Please choose y or n!\n";
           }
       } while (tolower(anotherItem) != 'y' && tolower(anotherItem) != 'n');

   } while (tolower(anotherItem) == 'y');
}

double tipDiscount(double &tip, double &discount, double cost) {
   readDouble("Enter the amount of tip you want to add $: ", tip);

   double total = cost + tip;

   if (total > 50.0) {
       discount = total * 0.10;
   } else if (total > 35.0 && total <= 50.0) {
       discount = total * 0.05;
   } else {
       discount = 0.0;
   }

   return total - discount;
}
Here is my output ( the one that I highlighted is where are the difference)

Please help me with that. Make sure post your output after fixed.

Transcribed Image Text:

Enter the name of your item: Fajita Bowl Enter the cost of your item $: 20.75 Do you want another item? (y/n): y Enter the name of your item: Vietnamese plate Enter the cost of your item $: 22.75 Do you want another item? (y/n): y Enter the name of your item: Soda Enter the cost of your item $: 3.50 Do you want another item? (y/n): x Invalid Option! Please choose y or n! Do you want another item? (y/n): n Enter the amount of tip you want to add $: 10.00 Your final total is: $51.30 You get a 5% discount! Your discount is $5.70 Your total after tip and discount is: $45.60 What would you like to do today? Pick an option from below: 1. Place an order 2. Quit >> 2 Thank you for using my program! Enter the name of your item: Fajita Bowl Enter the cost of your item $: 20.75 Do you want another item? (y/n): y Enter the name of your item: Vietnamese plate Enter the cost of your item $: 22.75 Do you want another item? (y/n): y Enter the name of your item: Soda Enter the cost of your item $: 3.50 Do you want another item? (y/n): x Invalid Option! Please choose y or n! Do you want another item? (y/n): n Enter the amount of tip you want to add $: 10.00 Your final total is: $51.30 You get a 5% discount! Your discount is $5.70 Your total after tip and discount is: $45.60 What would you like to do today? Pick an option from below: 1. Place an order 2. Quit >> 2 Thank you for using my program!