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#include <iostream>
#include <string>
#include <iomanip>
#include <sstream> // stringstream
#include <cctype> // isalph, isdigit
using namespace std;
class Customer
{
string custName; // Customer name
string custAddress; //Customer Address
void info()
{
cout << setw(10) << left << "Name" << custName << "\n"
<< setw(10) << left << "Address" << custAddress << "\n" << endl;
}
void simpleInfo()
{
cout << "Hello: " << custName << " , Address: " << custAddress << endl;
}
Customer() {}
~Customer() {}
Customer(string n, string a) {
custName = n;
custAddress = a;
}
}; // END OF CLASS
struct Beverage
{
string name; // The name
int quantity{}; // The quantity
double price{}; //The price
void info()
{
cout << setw(10) << left << "Name" << name << "\n"
<< setw(10) << left << "Price" << "$" << price << "\n"
<< setw(10) << left << "Quantity" << quantity << "\n"
<< setw(10) << left << "Total" << "$"
<< quantity * price << "\n" << endl;
}
void simpleInfo()
{
cout << "Selection: " << name << ", price per unit: $" << price << endl;
}
Beverage() {}
~Beverage() {}
Beverage(string n, double p) {
name = n;
price = p;
}
}; // END OF STRUCT
double totalCost(Beverage beverages[], int numOfBeverages);
void orderSummary(Beverage beverages[], int numOfBeverages);
bool isAllDigits(string input);
int getValidNumber(string text, int min, int max);
void doShopping();
void displayMenu(string userName) //Menu function
{
cout << endl << endl
<< userName
<< ", Please select the beverage you would like to purchase from the menu: "
<< endl;
cout << "Drink Menu" << endl;
cout << "========" << endl;
cout << "1 - Water $1.45" << endl;
cout << "2 - Soda $2.98" << endl;
cout << "3 - Iced Tea $3.29" << endl;
cout << "X - Exit " << endl << endl;
}
int main(void)
{
doShopping();
return 0;
}
int getQuantity() //Quantity function
{
int quantity = 0;
cout << "Enter quantity : ";
cin >> quantity;
return quantity;
}
bool isAllDigits(string input)
{
for (unsigned i = 0; i < input.length(); i++) {
if (!isdigit(input[i])) {
return false;
}
}
return true;
}
int getValidNumber(string text, int min, int max)
{
string input{};
int num{};
while (true)
{
cout << text << " [" << min << " - " << max << "]: ";
getline(cin, input);
stringstream ss(input);
if (!isAllDigits(ss.str())) {
cout << "\nInvalid input. Try again!" << endl;
}
else {
if (isAllDigits(ss.str()) && ss >> num) {
if (num >= min && num <= max) {
break;
}
else {
std::cout << "\nOut of range. Try again!" << endl;
}
}
}
}
return num;
}
double totalCost(Beverage beverages[], int numOfBeverages) //Total cost function
{
double totalCost = 0;
for (int i = 0; i < numOfBeverages; i++) {
totalCost += (beverages[i].price*beverages[i].quantity);
}
return totalCost;
}
void orderSummary(Beverage beverages[], int numOfBeverages) //Summary function
{
cout << "\n======= ORDER SUMMARY ====" << endl;
cout << "Items selected" << endl << endl;
for (int i = 0; i < numOfBeverages; i++) {
// only show beverages that has at least one order
if (beverages[i].quantity > 0) {
beverages[i].info();
}
}
}
void doShopping() //Shopping function
{
// declare our beverages
Beverage
water("Water", 1.45),
soda("Soda", 2.98),
iceTea("Ice Tea", 3.29);
// Beverage array to hold the beverages
Beverage beverages[] = { water, soda, iceTea };
char selection = ' ';
string name = "";
//Ask user for her/his name
cout << "Please enter your name ==> ";
getline(cin, name);
//display user name
cout << "Hello " + name << endl;
do
{
system("cls");
// display menu
displayMenu(name);
// read user selection
cout << "Your selection: ";
cin >> selection;
cin.get(); // takes last ENTER character in the stream
switch (selection)
{
case '1':
beverages[0].simpleInfo();
// assuming the customer can shop at least 1 and max 100
beverages[0].quantity += getValidNumber("Enter quantity", 1, 100);
break;
case '2':
beverages[1].simpleInfo();
beverages[1].quantity += getValidNumber("Enter quantity", 1, 100);
break;
case '3':
beverages[2].simpleInfo();
beverages[2].quantity += getValidNumber("Enter quantity", 1, 100);
break;
case 'X':
case 'x':
orderSummary(beverages, 3);
if (totalCost(beverages, 3) > 0) {
cout << "\nGrand total = $" << totalCost(beverages, 3) << endl;
}
cout << "\nThank you for your purchase, " << name << " Come back soon!!!" << endl;
break;
// other than 1, 2, 3 and X...
default: cout << "Invalid selection. Please try again";
cin.get();
// no break in the default case
}
cout << endl << endl;
} while (selection != 'X' && selection != 'x'); // 'X' or 'x' displays the summary
system("pause"); //Pauses the system until a key is hit, The the program will end.
}
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