private void compoundInterestToolStripMenuItem_Click(object sender, EventArgs e) { CompoundInterest compint = new CompoundInterest(); this.Hide(); compint.Show(); }
private void compoundInterestTSM_Click_1(object sender, EventArgs e) { CompoundInterest compint = new CompoundInterest(); this.Hide(); compint.Show(); }
private void button1_Click(object sender, EventArgs e) { // Basic variables // P is the principle double P; // r is the amount of money the person wants to deposit double monthlyContribution; // n is the total number of years double numberofYears; // Interest rate picked by the user double INTEREST_RATE; // totalContribution is how much money you would have deposited over time without interest double totalContribution; // Total money earned from interest alone double totalInterest; // we us little r to determine compound frequency with big r double R; double c = 0; try { P = double.Parse(tbInitialDeposit.Text); // N is total years numberofYears = double.Parse(tbNumberofYears.Text); // Get the interest rate / 100 INTEREST_RATE = double.Parse(tbInterestRate.Text) / 100; // r is how much you want to deposit per month monthlyContribution = double.Parse(tbmonthlyContribution.Text); if (cbTimesPerYear.Text == "Annual") { lblErrorHandler.Visible = true; // Number of times to compound c = 1; } else if (cbTimesPerYear.Text == "Bi - Annual") { lblErrorHandler.Visible = true; // Number of times to compound c = 2; } else if (cbTimesPerYear.Text == "Quarterly") { lblErrorHandler.Visible = true; // number of times to compound c = 4; } else if (cbTimesPerYear.Text == "Monthly") { lblErrorHandler.Visible = true; // number of times to compound c = 12; } // THE VARIABLE BELOW IS USED FOR MY OUTPUT, I KEPT THE CODE FOR MY OTHER OUTPUTS double conversion = CompoundInterest.CpInterestConversion(P, numberofYears, INTEREST_RATE, monthlyContribution, c); // R is how frequently to deposit per year R = (monthlyContribution * 6); // totalContribution is how much money you would have deposited without interest totalContribution = (R * numberofYears); // interest rate divided by how often to compound double ic = INTEREST_RATE / c; // Body of the left side of the equation double body = 1 + ic; // exponent for the left side of the equation double exponent = numberofYears * c; // using math.pow to execute the math in the proper order and to save all that in one variable double Body1 = P * Math.Pow(body, exponent); // we reuse the math.pow to save the same results again seperate from the first double body2first = Math.Pow(body, exponent); // minus one after the exponent is calculated double subtract = body2first - 1; // multiply that by the yearly deposit double body2 = R * subtract; // put the right half of the equation together, and divide by the demoninator double rightfinal = body2 / ic; // add the left and right half of the formula together double FV = Body1 + rightfinal; totalInterest = FV - (P + totalContribution); listBox1.Items.Add("< Calculations for " + numberofYears.ToString() + " years > " + cbTimesPerYear.Text); listBox1.Items.Add("Predicted Account Value :"); // CONVERSION CLASS IS OUTPUT HERE listBox1.Items.Add(conversion.ToString("c")); listBox1.Items.Add(" "); listBox1.Items.Add("Total Interest earned :"); listBox1.Items.Add(totalInterest.ToString("c")); listBox1.Items.Add(" "); listBox1.Items.Add("Total Deposited Money :"); listBox1.Items.Add(totalContribution.ToString("c")); listBox1.Items.Add(" "); listBox1.Items.Add("Account Math :"); listBox1.Items.Add(P.ToString("c") + " + " + totalContribution.ToString("c") + " + " + totalInterest.ToString("c")); // AND HERE listBox1.Items.Add(" = " + conversion.ToString("c")); listBox1.Items.Add(" "); // display text lblErrorHandler.Text = " ! Success !"; // make sure the text isnt red lblErrorHandler.ForeColor = System.Drawing.Color.Black; // change title header color label6.BackColor = System.Drawing.Color.LightGreen; } catch (Exception ex) { // Make sure the ERROR Handler is turned on lblErrorHandler.Visible = true; lblErrorHandler.ForeColor = System.Drawing.Color.Red; label6.BackColor = System.Drawing.Color.Red; lblErrorHandler.Text = "* ERROR *"; // Suggestions for why the code stopped working MessageBox.Show(ex.Message); listBox1.Items.Add("< ERROR TIPS >"); listBox1.Items.Add(" "); listBox1.Items.Add("1. NUMBERS ONLY"); listBox1.Items.Add(" "); listBox1.Items.Add("2. NONE of the fields can be empty"); listBox1.Items.Add(" "); listBox1.Items.Add("3. Ensure a Compound frequency"); listBox1.Items.Add(" is selected from the drop down list"); } }