Question

IN C#

Write a program to help a local restaurant automate its lunch billing system. The program should do the following:

1. Show the customer the different lunch items offered by the restaurant.
2. Allow the customer to select more than one item from the menu.
3. Calculate and print the bill. Assume that the restaurant offers the following lunch items (the price of each item is shown to the right of the item):
   

   Ham and Cheese Sandwich		$5.00
   Tuna Sandwich		$6.00
   Soup of the Day		$2.50
   Baked Potato		$3.00
   Salad		$4.75
   Chips		$2.00
   French Fries		$1.75
   Bowl of Fruit		$2.50

• Define a struct, menuItemType, with two components: menuItem of type string and menuPrice of type double.
• Use an array, menuList, of the struct menuItemType, that you just defined.
• Your program must contain at least the following functions:
  • Function getData: This function loads the data into the array menuList.
  • Function showMenu: This function shows the different items offered by the restaurant and tells the user how to select the items.
  • Function printCheck: This function calculates and prints the check. (Note that the billing amount should include a 5% tax.) A sample output is:

Welcome to Bob’s Restaurant:

Ham and Cheese Sandwich		$5.00
Chips		$2.00
Tax		$0.35
Total		$7.35

Your program must have the following:

• An introductory statement that allows the user to understand what type of program they are running.
• Variable declarations
• User input acceptance
• Proper mathematical calculations
• Proper output
• You must provide the following:
  • Your code
  • Screenshot of your fully functioning program with inputs/outputs

Answer 1

/* Source code*/

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace lunch_billing__system
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();

}

static string[] itemName = { "HamChess Sandwich", "Tuna Sandwich", "Soup of the Day", "Backed Potato", "Salad", "Chips", "French Fries", "Bowl of Fruit" };
static double[] itemPrice = { 5.00, 6.00, 2.50, 3.00, 4.75, 2.00, 1.75, 2.50 };
static int n = itemName.Length;
TextBox[] textBoxes;
Label[] labelsName;
Label[] labelsPrice;
static bool isValidInput = true;
private void Form1_Load(object sender, EventArgs e)
{
  
textBoxes = new TextBox[n];
labelsName = new Label[n];
labelsPrice = new Label[n];
int totalItem = itemName.Length;
Label Header = new Label();
Header.Location = new Point(10, 10);
this.Controls.Add(Header);
for (int i=0;i<totalItem;i++)
{
labelsName[i] = new Label();
labelsPrice[i] = new Label();
labelsName[i].Text = itemName[i];
textBoxes[i] = new TextBox();
labelsName[i].Location = new Point(10, 30 * (i + 1));
textBoxes[i].Location = new Point(130, 30 * (i + 1));
labelsPrice[i].Text = "$" + itemPrice[i].ToString();
labelsPrice[i].Location = new Point(250, 30 * (i + 1));
this.Controls.Add(labelsName[i]);
this.Controls.Add(textBoxes[i]);
this.Controls.Add(labelsPrice[i]);
}

Button btn = new Button();
btn.Text = "Save";
btn.Location = new Point(120, (n+2) * 30);
this.Controls.Add(btn);
btn.Click += Btn_Click;

  
  

}

void doCalculation()
{
  
StringBuilder sb = new StringBuilder();
string s = "ItemName\tPrice\tQuantity\tTotalPrice\n";
double total = 0;
sb.Append(s);
for (int i = 0; i < n; i++)
{
int quantity = 0;

if (Int32.TryParse(textBoxes[i].Text.ToString(), out quantity) && quantity>0) //check quantity should be atleast 1
{
double currentPrice = (quantity * itemPrice[i]);
s = labelsName[i].Text.ToString() + "\t" + labelsPrice[i].Text.ToString() + "\t" + textBoxes[i].Text.ToString() + "\t" + currentPrice.ToString() + "\n";
total += currentPrice;
sb.Append(s);
}

}
double tax = (total * 0.05);
s = "--------------------------------------------------------------------\nTax(5%):" + "\t\t" + tax + "\n";
sb.Append(s);
s = "Total : " + (total + tax);
sb.Append(s);
MessageBox.Show(sb.ToString());

  
}

private void Btn_Click(object sender, EventArgs e)
{
doCalculation();
}

  
}
}

/* Editor screen*/

/* Output screen*/

/* Form design*/

/* NOTE There is nothing in form design. Since controls are added dynamically based on item and calucaltion are done accordingly*/

/* Please run and see the output*/

/* Thanks for thumbs up :) */