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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 InvoiceTotal
{
public partial class frmInvoiceTotal : Form
{
public frmInvoiceTotal()
{
InitializeComponent();
}
int numInvoices = 0;
decimal smallestInvoice = Decimal.MaxValue;
decimal largestInvoice = 0m;
decimal avgInvoice = 0m;
decimal invoicesTotal = 0m;
private void btnCalculate_Click(object sender, EventArgs e)
{
decimal subtotal = Decimal.Parse(txtEnterSubtotal.Text);
decimal discountPercent = .25m;
decimal discountAmount = Math.Round(subtotal * discountPercent, 2);
decimal invoiceTotal = Math.Round(subtotal - discountAmount, 2);
numInvoices++;
invoicesTotal += invoiceTotal;
avgInvoice = invoicesTotal / numInvoices;
if (invoiceTotal < smallestInvoice)
smallestInvoice = invoiceTotal;
if (invoiceTotal > largestInvoice)
largestInvoice = invoiceTotal;
txtSubtotal.Text = subtotal.ToString("c");
txtDiscountPercent.Text = discountPercent.ToString("p1");
txtDiscountAmount.Text = discountAmount.ToString("c");
txtTotal.Text = invoiceTotal.ToString("c");
txtNumInvoices.Text = numInvoices.ToString();
txtSmallestInvoice.Text = smallestInvoice.ToString("c");
txtLargestInvoice.Text = largestInvoice.ToString("c");
txtAvgInvoice.Text = avgInvoice.ToString("c");
txtInvoicesTotal.Text = invoicesTotal.ToString("c");
txtEnterSubtotal.Focus();
}
private void btnExit_Click(object sender, EventArgs e)
{
this.Close();
}
private void btnClear_Click(object sender, EventArgs e)
{
numInvoices = 0;
smallestInvoice = Decimal.MaxValue;
largestInvoice = 0m;
avgInvoice = 0m;
invoicesTotal = 0m;
txtEnterSubtotal.Text = "";
txtSubtotal.Text = "";
txtDiscountPercent.Text = "";
txtDiscountAmount.Text = "";
txtTotal.Text = "";
txtNumInvoices.Text = "";
txtInvoicesTotal.Text = "";
txtSmallestInvoice.Text = "";
txtLargestInvoice.Text = "";
txtAvgInvoice.Text = "";
txtEnterSubtotal.Focus();
}
}
}
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