1. Loop Continue
ISYS 350

2. Exiting a loop using the break statement
In some cases it is necessary to end a loop before the test condition would end it
Use the break statement:
break;

3. Example while (true) { MessageBox.Show("Looping");
if (MessageBox.Show("Do you want to continue?", "Loop demo", MessageBoxButtons.YesNo) == DialogResult.No)
MessageBox.Show("Leaving loop");
break; }

4. Years to Reach Targeted Future Value Future Value=Present Value
Years to Reach Targeted Future Value Future Value=Present Value*(1+Rate)Year Note: When year=0, future value=present value

5. Method 1 double PresentValue, Rate, Target, YearToTarget, futureValue;
PresentValue = double.Parse(textBox1.Text);
Rate = double.Parse(textBox2.Text);
Target = double.Parse(textBox3.Text);
futureValue = PresentValue;
YearToTarget = 0;
while (futureValue < Target) {
YearToTarget = YearToTarget + 1;
futureValue = PresentValue * Math.Pow(1 + Rate, YearToTarget); }
textBox4.Text = YearToTarget.ToString();

6. Method 2: Using a flag
double PresentValue, Rate, Target, YearToTarget, futureValue;
Boolean continueFlag = true;
PresentValue = double.Parse(textBox1.Text);
Rate = double.Parse(textBox2.Text);
Target = double.Parse(textBox3.Text);
futureValue = PresentValue;
YearToTarget = 0;
while (continueFlag) {
if (futureValue < Target)
YearToTarget = YearToTarget + 1;
futureValue = PresentValue * Math.Pow(1 + Rate, YearToTarget); }
else
continueFlag=false;
textBox4.Text = YearToTarget.ToString();

7. Method 3: Using Break
double PresentValue, Rate, Target, YearToTarget, futureValue;
Boolean continueFlag = true;
PresentValue = double.Parse(textBox1.Text);
Rate = double.Parse(textBox2.Text);
Target = double.Parse(textBox3.Text);
futureValue = PresentValue;
YearToTarget = 0;
while (continueFlag) {
if (futureValue < Target)
YearToTarget = YearToTarget + 1;
futureValue = PresentValue * Math.Pow(1 + Rate, YearToTarget); }
else
break;
textBox4.Text = YearToTarget.ToString();

8. Method 4: using for loop
double PresentValue, Rate, Target, YearToTarget, futureValue;
PresentValue = double.Parse(textBox1.Text);
Rate = double.Parse(textBox2.Text);
Target = double.Parse(textBox3.Text);
for (YearToTarget = 0; true; YearToTarget++) {
futureValue = PresentValue * Math.Pow(1 + Rate, YearToTarget);
if (futureValue >= Target)
break; }
textBox4.Text = YearToTarget.ToString();
Note: for (YearToTarget = 0; true; YearToTarget++)

9. Straight Line Depreciation Table

10. dataGridView Control Properties
ColumnCount: specify the number of columns
dataGridView1.ColumnCount = 4;
Columns collection
each column is identified by an index, first column index is 0
Each column has a HeaderText property:
Ex. dataGridView1.Columns[0].HeaderText = "Year";
Rows collection
Clear all rows: dataGridView1.Rows.Clear();
each row is identified by an index, first row index is 0
Adding a blank row:
dataGridView1.Rows.Add();
Each Row has a Cells collection
Each cell is identified by an index
Has a value property:
dataGridView1.Rows[year - 1].Cells[0].Value = year;

11. Future Value Table FV = PV * (1 +Rate) Year

12. Code Example dataGridView1.ColumnCount = 2;
dataGridView1.Columns[0].HeaderText = "Year";
dataGridView1.Columns[1].HeaderText = "Future Value";
double pv, rate, lastYear, fv;
pv = double.Parse(textBox1.Text);
rate = double.Parse(textBox2.Text);
lastYear = double.Parse(textBox3.Text);
dataGridView1.Rows.Clear();
for (int year = 1; year <= lastYear; year++) {
dataGridView1.Rows.Add();
fv = pv * Math.Pow(1 + rate, year);
dataGridView1.Rows[year - 1].Cells[0].Value = year;
dataGridView1.Rows[year - 1].Cells[1].Value = fv.ToString("c"); }

13. Depreciation Table Code Example
dataGridView1.ColumnCount = 4;
dataGridView1.Columns[0].HeaderText = "Year";
dataGridView1.Columns[1].HeaderText = "Value at Begining of Year";
dataGridView1.Columns[2].HeaderText = "Depreciation During Year";
dataGridView1.Columns[3].HeaderText = "Total depreciation to End of Year";
double value, life, depreciation, totalDepreciation=0;
value = double.Parse(textBox1.Text);
life = double.Parse(textBox2.Text);
depreciation = value / life;
dataGridView1.Rows.Clear();
for (int year = 1; year <= life; year++) {
dataGridView1.Rows.Add();
dataGridView1.Rows[year - 1].Cells[0].Value = year;
dataGridView1.Rows[year - 1].Cells[1].Value = value.ToString("c");
dataGridView1.Rows[year-1].Cells[2].Value = depreciation.ToString("c");
totalDepreciation += depreciation;
dataGridView1.Rows[year - 1].Cells[3].Value = totalDepreciation.ToString("c");
value -= depreciation; }

14. Alternating Row Color dataGridView1.ColumnCount = 2;
dataGridView1.Columns[0].HeaderText = "Year";
dataGridView1.Columns[1].HeaderText = "Future Value";
double pv, rate, lastYear, fv;
pv = double.Parse(textBox1.Text);
rate = double.Parse(textBox2.Text);
lastYear = double.Parse(textBox3.Text);
dataGridView1.Rows.Clear();
for (int year = 1; year <= lastYear; year++) {
dataGridView1.Rows.Add();
fv = pv * Math.Pow(1 + rate, year);
dataGridView1.Rows[year - 1].Cells[0].Value = year;
dataGridView1.Rows[year - 1].Cells[1].Value = fv.ToString("c");
if (year % 2 == 0)
dataGridView1.Rows[year - 1].DefaultCellStyle.BackColor = Color.AliceBlue;
else
dataGridView1.Rows[year - 1].DefaultCellStyle.BackColor = Color.Pink; }

15. A Loop that is Inside Another Loop is Called a Nested Loop

16. Nested Loop Example A clock is an example of a nested loop
For each hour,
Minute hand moves 60 times for each hour
for (int hour = 0; hour < 24; hour++) {
for (int minute = 0; minute < 60; minute++)
MessageBox.Show("Hour: " + hour.ToString() + " Minute: " + minute.ToString()); }

17. Using dataGridView

18. double rate, year, presentValue, futureValue;
presentValue = double.Parse(textBox1.Text);
dataGridView1.ColumnCount = 5;
dataGridView1.Columns[0].HeaderText = "Rate/Year";
dataGridView1.Columns[1].HeaderText = "5";
dataGridView1.Columns[2].HeaderText = "10";
dataGridView1.Columns[3].HeaderText = "15";
dataGridView1.Columns[4].HeaderText = "20";
int rowIndex = 0, colIndex;
dataGridView1.Rows.Clear();
for (rate = 0.03; rate <= 0.05; rate += 0.005) {
dataGridView1.Rows.Add();
colIndex = 0;
dataGridView1.Rows[rowIndex].Cells[colIndex].Value = rate.ToString("p2");
for (year = 5; year <= 20; year += 5)
futureValue = presentValue * Math.Pow(1 + rate, year);
colIndex += 1;
dataGridView1.Rows[rowIndex].Cells[colIndex].Value = futureValue.ToString("c"); }
rowIndex += 1;

20. Code Example:loop control variable used as row/column index
int rows = 9, cols = 10, Product;
dataGridView1.ColumnCount = cols;
dataGridView1.Columns[0].HeaderText = "";
dataGridView1.Columns[0].Width = 25;
for (int col = 2; col <= cols; col++) {
dataGridView1.Columns[col-1].HeaderText = (col-1).ToString();
dataGridView1.Columns[col-1].Width = 25; }
for (int rowIndex = 1; rowIndex <= rows; rowIndex++)
dataGridView1.Rows.Add();
dataGridView1.Rows[rowIndex - 1].Cells[0].Value = rowIndex.ToString();
for (int colIndex = 2; colIndex <= cols; colIndex++)
Product= rowIndex * (colIndex-1);
dataGridView1.Rows[rowIndex - 1].Cells[colIndex-1].Value = Product.ToString();