future value 3

1 files changed, 139 insertions, 0 deletions

diff --git a/future_value3/FutureValue/frmFutureValue.cs b/future_value3/FutureValue/frmFutureValue.cs
new file mode 100644
index 0000000..4f5c705
--- /dev/null
+++ b/future_value3/FutureValue/frmFutureValue.cs
@@ -0,0 +1,139 @@
+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 FutureValue

+{

+	public partial class frmFutureValue : Form

+	{

+		public frmFutureValue()

+		{

+			InitializeComponent();

+		}

+

+		// DONE: Declare the rectangular array and the row index here

+		string[,] calculations = new string[10, 4];

+		int row = 0;

+

+		private void btnCalculate_Click(object sender, EventArgs e)

+		{

+			try {

+				if (IsValidData()) {

+					decimal monthlyInvestment =

+						Convert.ToDecimal(txtMonthlyInvestment.Text);

+					decimal yearlyInterestRate =

+						Convert.ToDecimal(txtInterestRate.Text);

+					int years = Convert.ToInt32(txtYears.Text);

+

+					int months = years * 12;

+					decimal interestRateMonthly = yearlyInterestRate / 12 / 100;

+

+					decimal futureValue = CalculateFutureValue(

+						monthlyInvestment, interestRateMonthly, months);

+					txtFutureValue.Text = futureValue.ToString("c");

+					txtMonthlyInvestment.Focus();

+

+					// DONE: Add the calculation to the rectangular array here

+					calculations[row, 0] = monthlyInvestment.ToString("c");

+					calculations[row, 1] = yearlyInterestRate.ToString("p");

+					calculations[row, 2] = years.ToString();

+					calculations[row, 3] = futureValue.ToString("c");

+					row++;

+				}

+			}

+			catch (Exception ex) {

+				MessageBox.Show(ex.Message + "\n\n" +

+					ex.GetType().ToString() + "\n" +

+					ex.StackTrace, "Exception");

+			}

+		}

+

+		public bool IsValidData()

+		{

+			bool success = true;

+			string errorMessage = "";

+

+			// Validate the Monthly Investment text box

+			errorMessage += IsDecimal(txtMonthlyInvestment.Text, txtMonthlyInvestment.Tag.ToString());

+			errorMessage += IsWithinRange(txtMonthlyInvestment.Text, txtMonthlyInvestment.Tag.ToString(), 1, 1000);

+

+			// Validate the Yearly Interest Rate text box

+			errorMessage += IsDecimal(txtInterestRate.Text, txtInterestRate.Tag.ToString());

+			errorMessage += IsWithinRange(txtInterestRate.Text, txtInterestRate.Tag.ToString(), 1, 20);

+

+			// Validate the Number of Years text box

+			errorMessage += IsInt32(txtYears.Text, txtYears.Tag.ToString());

+			errorMessage += IsWithinRange(txtYears.Text, txtYears.Tag.ToString(), 1, 40);

+

+			if (errorMessage != "") {

+				success = false;

+				MessageBox.Show(errorMessage, "Entry Error");

+			}

+			return success;

+		}

+

+		public static string IsPresent(string value, string name)

+		{

+			string msg = "";

+			if (value == "")

+				msg += name + " is a required field.\n";

+			return msg;

+		}

+

+		public static string IsDecimal(string value, string name)

+		{

+			string msg = "";

+			if (!Decimal.TryParse(value, out _))

+				msg += name + " must be a valid decimal value.\n";

+			return msg;

+		}

+

+		public static string IsInt32(string value, string name)

+		{

+			string msg = "";

+			if (!Int32.TryParse(value, out _))

+				msg += name + " must be a valid integer value.\n";

+			return msg;

+		}

+

+		public static string IsWithinRange(string value, string name, decimal min, decimal max)

+		{

+			string msg = "";

+			if (Decimal.TryParse(value, out decimal number))

+				if (number < min || number > max)

+					msg += name + " must be between " + min + " and " + max + ".\n";

+			return msg;

+		}

+		private decimal CalculateFutureValue(decimal monthlyInvestment,

+			decimal monthlyInterestRate, int months)

+		{

+			decimal futureValue = 0m;

+			for (int i = 0; i < months; i++)

+				futureValue = (futureValue + monthlyInvestment)

+					* (1 + monthlyInterestRate);

+			return futureValue;

+		}

+

+		private void btnExit_Click(object sender, EventArgs e)

+		{

+			// DONE: Display the rectangular array in a dialog box here

+			string msg = "Inv/Mo\tRate\tYears\tFuture Values\n";

+			if (row > 0) {

+				for (int i = 0; i < row; i++) {

+					for (int j = 0; j < 4; j++)

+						msg += calculations[i, j] + "\t";

+					msg += "\n";

+				}

+				MessageBox.Show(msg, "Future Value Calculations");

+			}

+			this.Close();

+		}

+

+	}

+}