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| author | | 1970-01-01 00:00:00 +0000 |
|---|---|---|
| committer | | 2025-01-08 04:47:26 +0000 |
| commit | 1699ad285b7b7cd4aad7be41a0703d5e428fe55d (patch) | |
| tree | a511b7ed4a73e2acd33261ecd75761477f2ded5b /future_value4/FutureValue/frmFutureValue.cs | |
| parent | payment (diff) | |
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future value 4
Diffstat (limited to 'future_value4/FutureValue/frmFutureValue.cs')
| -rw-r--r-- | future_value4/FutureValue/frmFutureValue.cs | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/future_value4/FutureValue/frmFutureValue.cs b/future_value4/FutureValue/frmFutureValue.cs new file mode 100644 index 0000000..33f948d --- /dev/null +++ b/future_value4/FutureValue/frmFutureValue.cs @@ -0,0 +1,132 @@ +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(); + } + + private void frmFutureValue_Load(object sender, EventArgs e) + { + for (int i = 1; i <= 20; ++i) + cboYears.Items.Add(i); + cboYears.SelectedIndex = 2; + } + + private void btnCalculate_Click(object sender, EventArgs e) + { + try { + if (IsValidData()) { + lstValues.Items.Clear(); + + decimal monthlyInvestment = + Convert.ToDecimal(txtMonthlyInvestment.Text); + decimal yearlyInterestRate = + Convert.ToDecimal(txtInterestRate.Text); + + int years = (int)cboYears.SelectedItem; + int months = years * 12; + decimal monthlyInterestRate = yearlyInterestRate / 12 / 100; + + for (int i = 1; i <= months; ++i) + if (i % 12 == 0) { + decimal futureValue = CalculateFutureValue( + monthlyInvestment, monthlyInterestRate, i); + lstValues.Items.Add("Year " + i/12 + ": " + + futureValue.ToString("c")); + } + } + } + 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); + + 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 interestRateMonthly, int months) + { + decimal futureValue = 0m; + for (int i = 0; i < months; i++) { + futureValue = (futureValue + monthlyInvestment) + * (1 + interestRateMonthly); + } + return futureValue; + } + + private void btnExit_Click(object sender, EventArgs e) + { + this.Close(); + } + } +} |