Question

In Microsoft Visual Studio (C#):

An Internet service provider offers four subscription packages to its customers, plus a discount for nonprofit organizations:

Package A: 10 hours of access for $12.95 per month.  Additional hours are $4.00 per hour.

Package B: 20 hours of access for $14.95 per month.  Additional hours are $2.00 per hour.

Package C: 30 hours of access for $20 per month.  Additional hours are $1.00 per hour.

Package D: Unlimited access for $35.95 per month.

A nonprofit organizations will get 20% discount on all packages.

The user should select the package the customer has purchased from a set of radio buttons and enter the number of hours used in a textbox.  A check box captioned “Nonprofit organization” should appear on the form.  The application should calculate and display the total amount due with a textbox.

Input validation: The number of hours used in a month must contain digits only and cannot exceed 744.  You must use Validating event to do the validation.

Test your program with these data:

a. Package B using 25 hours, not non-profit: cost: $24.95

b. Package C using 40 hours, is non-profit: cost;$24

Answer 1

Design:

code:

using System;
using System.Windows.Forms;

namespace InternetProvider
{
    public partial class Form1 : Form
    {
        double NonProfitDiscount,price,total;
        int hours;

        public Form1()
        {
            InitializeComponent();
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void btnCalculate_Click(object sender, EventArgs e)
        {

            try //validation for inputbox number only
            {
                hours = Convert.ToInt32(txtHours.Text);
                if (hours > 744 || hours < 1)
                    MessageBox.Show("Entered hours is between 1-744");
            }
            catch (Exception h)
            {
                MessageBox.Show("Please provide number only");
            }
            if (chkNonProfit.Checked == true) //if nonprofit checkbox checked
            {

               // MessageBox.Show("20% discount on Nonprofit");
                if (rbtn10Hours.Checked == true)
                {
                    //MessageBox.Show("$12.95");
                    if (hours > 0 && hours <= 10)
                    {
                        price = 12.95; //actual price
                        NonProfitDiscount = 12.95 *.20; //calculate 20%
                        total = price - NonProfitDiscount; //total calculate - 20%
                        label3.Text = "$" + total.ToString(); //diplay total price after discount
                    }
                    else
                    {
                        hours = hours - 10; //calaculate the extra hours
                        double hours1 = (hours * 4) + 12.95; //calculate the extra hours of $4 per hours
                        NonProfitDiscount = hours1 *.20; //calculate 20%
                        total = hours1 - NonProfitDiscount;//total calculate - 20%
                        label3.Text = "$" + total.ToString(); //diplay total price after discount
                    }
                }
                else if (rbtn20Hours.Checked == true)
                {
                    //MessageBox.Show("$14.95");
                    if (hours > 0 && hours <= 20)
                    {
                        price = 14.95;//actual price
                        NonProfitDiscount = 14.95 *.20;//calculate 20%
                        total = price - NonProfitDiscount; //total calculate - 20%
                        label3.Text = "$" + total.ToString(); //diplay total price after discount
                    }
                    else
                    {
                        hours = hours - 20;//calaculate the extra hours
                        double hours1 = (hours * 2) + 14.95;//calculate the extra hours of $4 per hours
                        NonProfitDiscount = hours1 *.20; //calculate 20%
                        total = hours1 - NonProfitDiscount; //total calculate - 20%
                        label3.Text = "$" + total.ToString(); //diplay total price after discount
                    }
                }
                else if (rbtn30Hours.Checked == true)
                {
                    //MessageBox.Show("$20");
                    if (hours > 0 && hours <= 30)
                    {
                        price = 20.00; //actual price
                        NonProfitDiscount = 20.00 * .20; //calculate 20%
                        total = price - NonProfitDiscount; //total calculate - 20%
                        label3.Text = "$" + total.ToString(); //diplay total price after discount
                    }
                    else
                    {
                        hours = hours - 30; //calaculate the extra hours
                        double hours1 = (hours * 2) + 30.00; //calculate the extra hours of $4 per hours
                        NonProfitDiscount = hours1 *.20; //calculate 20%
                        total = hours1 - NonProfitDiscount; //total calculate - 20%
                        label3.Text = "$" + total.ToString(); //diplay total price after discount
                    }
                }
                else if (rbtnUnlimitedHours.Checked == true)
                {
                    MessageBox.Show("Unlimited Access");
                    if (hours > 0)
                    {
                        price = 35.95;//actual price
                        NonProfitDiscount = 20.00 * .20; //calculate 20%
                        total = price - NonProfitDiscount; //total calculate - 20%
                        label3.Text = "$" + price.ToString(); //diplay total price after discount
                    }
                }
            }
            else //if nonprofit checkbox not checked
            {
                if (rbtn10Hours.Checked == true)
                {
                    //MessageBox.Show("$12.95");
                    if (hours > 0 && hours <= 10)
                    {
                        price = 12.95; //actual price
                        label3.Text = "$" + price.ToString(); //display the price
                    }
                    else
                    {
                        hours = hours - 10;//calculate extra hours price
                        double hours1 = (hours * 4) + 12.95; //calculate total price
                        label3.Text = "$" + hours1.ToString(); //display total
                    }
                }
                else if (rbtn20Hours.Checked == true)
                {
                    //MessageBox.Show("$14.95");
                    if (hours > 0 && hours <= 20)
                    {
                        price = 14.95; //actual price
                        label3.Text = "$" + price.ToString(); //display the price
                    }
                    else
                    {
                        hours = hours - 20; //calculate extra hours price
                        double hours1 = (hours * 2) + 14.95;//calculate total price
                        label3.Text = "$" + hours1.ToString(); //display total
                    }
                }
                else if (rbtn30Hours.Checked == true)
                {
                   // MessageBox.Show("$30");
                    if (hours > 0 && hours <= 30)
                    {
                        price = 20.00; //actual price
                        label3.Text = "$" + price.ToString(); //display the price
                    }
                    else
                    {
                        hours = hours - 30; //calculate extra hours price
                        double hours1 = (hours * 1) + 20.00; //calculate total price
                        label3.Text = "$" + hours1.ToString(); //display total
                    }
                }
                else if (rbtnUnlimitedHours.Checked == true)
                {
                    MessageBox.Show("Unlimited Access");
                    if (hours > 0)
                    {
                        price = 35.95; //actual price
                        label3.Text = "$"+price.ToString(); //display total
                    }
                }
            }
        }  
    }
}

output: