Question

Fix the code using C# shown below to show the repitition as seen on the example screenshot: (Invalid error must repeat):

the of What i he item? - -10 Invalid data entered- Please re-enter the amount of the item- n Invalid data entered - Please re-enter the amount of the item - h Invalid data entered - Please re-enter the amount of the item -5.e s amount t

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Program
{
class Program
{
static void Main(string[] args)
{
double num, count = 0;
double Tax = 0.00, ship = 5.00, sum = 0.00;
double grandtotal;
char line;

//Set run =true
bool run=true;
do
{

//read amount of item
Console.WriteLine("What is the amount of item : ");
//read in num
run=double.TryParse(Console.ReadLine(), out num);
//check if run is not true that means returns false if entered
//value is not number of type double
while (!run)
{
//prompt for value
Console.WriteLine("Please re-enter : ");
Console.WriteLine("What is the amount of item : ");
//read in num
run = double.TryParse(Console.ReadLine(), out num);

//check if run is true and num is less than 0
if (run && num < 0)
{
Console.WriteLine("Please re-enter : ");
run = double.TryParse(Console.ReadLine(), out num);
}
}

sum = sum + num;
count = count + 1;
Console.WriteLine("\nDo you want to purchase more items ? -Y or N : ");
line = char.Parse(Console.ReadLine());

} while (line != 'n' && line != 'N');

Console.WriteLine("-----------------------------------------------");
Console.WriteLine("\t\tSales Receipt\t\t\t");
Console.WriteLine("Total Purchase : \t\t\t$" + string.Format("{0:0.00}", sum));
ship = sum / 10;
Console.WriteLine("Shippint charges :\t\t\t$" + string.Format("{0:0.00}", ship));
Console.WriteLine("Number of item purchased:\t\t" + count);

if (count <= 3)
{
ship = 3.50;
Console.WriteLine("Sales Tax:\t\t\t\t$" + string.Format("{0:0.00}", ship));
}
else if (count > 3 && count < 7)
{
ship = 5.00;
Console.WriteLine("Sales Tax:\t\t\t\t$" + string.Format("{0:0.00}", ship));
}
else if (count > 6 && count < 11)
{
ship = 7.00;
Console.WriteLine("Sales Tax:\t\t\t\t$" + string.Format("{0:0.00}", ship));
}
else if (count > 10 && count < 16)
{
ship = 9.00;
Console.WriteLine("Sales Tax:\t\t\t\t$" + string.Format("{0:0.00}", ship));
}
else
{
ship = 10.00;
Console.WriteLine("Sales Tax:\t\t\t\t$" + string.Format("{0:0.00}", ship));
}

Console.WriteLine("-----------------------------------------------");
grandtotal = sum + ship + Tax;
Console.WriteLine("Grand Total : \t\t\t\t$" + string.Format("{0:0.00}", grandtotal));

Console.ReadKey();

}
}
}

Answer 1

Updated C# Program:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Program
{
    class Program
    {
        static void Main(string[] args)
        {
            double num, count = 0;
            double Tax = 0.00, ship = 5.00, sum = 0.00;
            double grandtotal;
            char line;

            //Set run =true
            bool run = true;
            do
            {
                //read amount of item
                Console.Write("What is the amount of item? - ");
                //read in num
                run = double.TryParse(Console.ReadLine(), out num);
                //check if run is not true that means returns false if entered
                //value is not number of type double
                while (!run || num < 0)
                {
                    //prompt for value
                    Console.Write("Invalid data entered - Please re-enter the amount of item - ");
                    //read in num
                    run = double.TryParse(Console.ReadLine(), out num);
                }

                sum = sum + num;
                count = count + 1;
                Console.WriteLine("\nDo you want to purchase more items ? -Y or N : ");
                line = char.Parse(Console.ReadLine());

            } while (line != 'n' && line != 'N');

            Console.WriteLine("-----------------------------------------------");
            Console.WriteLine("\t\tSales Receipt\t\t\t");
            Console.WriteLine("Total Purchase : \t\t\t$" + string.Format("{0:0.00}", sum));
            ship = sum / 10;
            Console.WriteLine("Shippint charges :\t\t\t$" + string.Format("{0:0.00}", ship));
            Console.WriteLine("Number of item purchased:\t\t" + count);

            if (count <= 3)
            {
                ship = 3.50;
                Console.WriteLine("Sales Tax:\t\t\t\t$" + string.Format("{0:0.00}", ship));
            }
            else if (count > 3 && count < 7)
            {
                ship = 5.00;
                Console.WriteLine("Sales Tax:\t\t\t\t$" + string.Format("{0:0.00}", ship));
            }
            else if (count > 6 && count < 11)
            {
                ship = 7.00;
                Console.WriteLine("Sales Tax:\t\t\t\t$" + string.Format("{0:0.00}", ship));
            }
            else if (count > 10 && count < 16)
            {
                ship = 9.00;
                Console.WriteLine("Sales Tax:\t\t\t\t$" + string.Format("{0:0.00}", ship));
            }
            else
            {
                ship = 10.00;
                Console.WriteLine("Sales Tax:\t\t\t\t$" + string.Format("{0:0.00}", ship));
            }

            Console.WriteLine("-----------------------------------------------");
            grandtotal = sum + ship + Tax;
            Console.WriteLine("Grand Total : \t\t\t\t$" + string.Format("{0:0.00}", grandtotal));

            Console.ReadKey();

        }
    }
}

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Sample Run:

file:///c/users/saibabu/documents/visual studio 2010/Projects/Program/Program/bin/Debug/Prog.... S What is the amount of item?-10 Invalid data enteredPlease re-enter the amount of item -n Invalid data entered Please re-enter the amount of item -h Invalid data entered - Please re-enter the amount of item-5.0 Do you want to purchase more items-Y or N : Sales Receipt Total Purchase $5.00 S0.50 S3.50 $8.50 hippint charges Number of item purchased: ales Tax: Grand Total: