In C#, Based on Receipt Version 3, add input validation with regular expression.

1. Item name filed. -- Allow multiple words to be entered -- Uppercase/lowercase letters allowded -- 0 to 9 allowed -- White space, (), &, _, -, ., + allowed

2. Quantity field. -- 0 to 9 allowed

3. Price field. -- 0 to 9 allowed -- . allowed

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Reciept Version 3 Below

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ReceiptVersion3

{

class Program

{

static void Main(string[] args)

{

//declare variable to hold count

int count = 0;

//declare a 2d array

string[,] items = new string[100, 4];

//variable that controls the loop

bool repeat = true;

//variable to hold item name

string name;

//variables to hold price,subtotal, tax and total

decimal price, subtotal = 0.0M, tax, total;

//variable to hold quantity

int quantity;

//do-while loop that reads items from user until user enters 0

do

{

//run a loop to read the items

for (int i = 0; i

{

//read the item name

Console.Write(" Item Name (enter 0 to stop): ");

name = Console.ReadLine();

//if user entered 0 exit the loop by setting repeat to false

if (name.Trim() == "0")

{

repeat = false;

break;

}

//else continue read the item details

else

{

//read the price of the item

Console.Write(" Item Price: $");

//convert it to decimal by removing $ from the user input

price = Convert.ToDecimal(Console.ReadLine().Replace('$', ' ').Trim());

//prompt and read the quantity

Console.Write(" Quantity: ");

quantity = Convert.ToInt32(Console.ReadLine());

//compute subtotal

subtotal = price * quantity;

//store the item details int the array

items[i, 0] = name;

items[i, 1] = price.ToString();

items[i, 2] = quantity.ToString();

items[i, 3] = subtotal.ToString();

count++; //increment count

}

}

} while (repeat);

//loop through the items array and compute the sub total

subtotal = 0.0M;

for (int i = 0; i

{

subtotal = subtotal + Convert.ToDecimal(items[i, 3]);

}

//calculate the tax

tax = subtotal * Convert.ToDecimal(0.065);

//calculate the total

total = subtotal + tax;

//add $ symbol for price and subtotal in the array

for (int i = 0; i

{

items[i, 1] = "$" + items[i, 1];

items[i, 3] = "$" + items[i, 3];

}

//print the receipt

Console.WriteLine(" Your Receipt ");

//print the header

Console.WriteLine("Item\t\tPrice\t Quantity\t Subtotal ");

//loop through the array and print the items

for (int i = 0; i

{

for (int j = 0; j

{

//{0,-15} is used to left align and fix a length of 15, 0 represents the index of the output parameter

Console.Write("{0,-15}", items[i, j]);

}

Console.WriteLine();

}

//print the subtotal

Console.WriteLine(" Subtotal : $" + subtotal.ToString("0.00"));

//print the tax

Console.WriteLine(" Tax(0.065%) : $" + tax.ToString("0.00"));

//print the total

Console.WriteLine(" Total : $" + total.ToString("0.00"));

//terminate the program

Console.Write(" Press any key to exit...");

Console.ReadKey();

}

}

}

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Output Should Look Like this down below

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Scan Items Now Item Name (en r e to stop) sadfsd dsaf nter Quantity: 3 nter Price: 33.33 Item Name (enter to stop) asdfee1 nter Quantity: 2 nter Price: 3.3 Item Name (enter to stop): asf sadf-11 nter Quantity: 1 nter Price: 3 Item Name(enter to stop): Your Receipt Price Quantity Subtotal Item sadfsd dsaf 33.33 99.99