Chapter 3 Part 2 1

Displaying Output

Chapter 3 Section 3.5 Output FormattingChapter 3 Section 3.6 Group Boxes, etc.Chapter 3 Section 3.7 Sample ProgramChapter 3 Section 3.8 Logic Errors

Chapter 3 Part 2 2

Number Formats

Function Description

FormatNumber Includes commas and specified number of decimal points.

FormatCurrency Includes commas, decimal points, and currency symbol.

FormatPercent Formats value as a percent.

FormatDateTime Formats expression as a date, time, or both.

Chapter 3 Part 2 3

FormatNumber Function

Default Format 2 decimal places Commas as needed

Syntax FormatNumber(value)

ExamplesFormatNumber(12345.678) 12,345.68*FormatNumber(12) 12.00FormatNumber(.75) 0.75

Note: Rounding occurs.

Chapter 3 Part 2 4

FormatNumber Function*

Optional ArgumentFormatNumber(value, #decimal places)

Examples:FormatNumber(4567, 4) 4,567.0000

FormatNumber(45678.473, 1) 45,678.5

FormatNumber(4567.243, 0) 4,567 Skip: bottom section of p. 139

& top p. 140Next several slides show values as arguments as examples;use variable names in real programs to avoid magic numbers.

Chapter 3 Part 2 5

FormatCurrency Function

Default Format: Dollar sign Rounds to 2 decimal places.

Examples:FormatCurrency(87321.784) $87,321.78

FormatCurrency(44) $44.00

FormatCurrency(3.658) $3.66

Chapter 3 Part 2 6

FormatPercent Function

Default Format: Multiplies argument by 100 Rounds to 2 decimal places Displays percent sign

Examples:FormatPercent(.783) 78.30%FormatPercent(.48129) 48.13%FormatPercent(55) 5,500.00%FormatPercent(.3862, 1) 38.6%

Chapter 3 Part 2 7

FormatDateTime

SyntaxFormatDateTime(expression [, Format])

Examples:FormatDateTime(systemDate, DateFormat.LongDate)

Wednesday, September 17, 2003

FormatDateTime(systemDate, DateFormat.ShortDate)

9/17/03

Chapter 3 Part 2 8

FormatDateTime

More ExamplesFormatDateTime(systemDate, DateFormat.LongTime)

03:22:18 PM

FormatDateTime(systemDate, DateFormat.ShortDate)

15:22

FormatDateTime(systemDate, DateFormat.GeneralDate)

09/17/2003 3:22:18 PM

Chapter 3 Part 2 9

Label Formats

PropertiesSet TextAlign for values (typically right).

CodelblTotal.Text = FormatCurrency(Total)

Chapter 3 Part 2 10

Formatted Text and Captions

Chapter 3 Part 2 11

GroupBox Control (p. 144)

Appears as a rectangular border with an optional title in the upper-left corner.

Contains and organizes controls.

Chapter 3 Part 2 12

GroupBox Creation Process

1. Create GroupBox control first.

2. Select the GroupBox.

3. Double-click controls from toolbox to appear within the GroupBox.

Other controls are part of GroupBox and move with it.

Chapter 3 Part 2 13

GroupBox ControlMoving Existing Controls to It

1. Select existing control(s).

2. Cut the selected control(s).

3. Select the GroupBox control.

4. Paste the selected control(s).

Chapter 3 Part 2 14

GroupBox TabIndex

Set GroupBox control with Tab Order. Click controls inside GroupBox to provide tab

order for those controls.

Chapter 3 Part 2 15

GroupBox Access Keys

GroupBox itself cannot have focus. You can use & to set an access key. When a person uses the access key, the

focus moves to the control with the lowest TabIndex value inside the GroupBox control.

Chapter 3 Part 2 16

Form Formatting (pp. 146-147)

Selecting and Moving Multiple Controls Click and drag a selection box around the

controls. Press Ctrl as you click controls.

Chapter 3 Part 2 17

Format Menu (Review)

Align (p. 148) Lefts Rights Centers Horizontal Alignment

Size (p. 149) Make Same Size

Chapter 3 Part 2 18

Form Load

Executes when the form loads into memory. Example: declaring object variable to create

instance of splash screen form (see Chapters 7 and 8)

Double-click form to see Form Load event procedure.

Chapter 3 Part 2 19

Section 3.7 Program Development

Complete Section 3.7 to develop the Highlander Hotel program. Note design sketches (pp. 150-151). Study control planning grids, including

Methods (pp. 151-153). Follow flowcharts (pp. 154-155).

Hint: Study flowchart shapes in case you see a test question.

Complete Tutorial 3-10 (pp. 156-161).

Chapter 3 Part 2 20

Color Changes in Code (p. 159)

ForeColor and BackColor Properties Color.Black

Color.RedColor.Blue

lblOutput.ForeColor = Color.Blue

Chapter 3 Part 2 21

Logic Errors (p. 162)

Mistake that does not prevent a program from running BUT causes the program to produce inaccurate results.

Examples: Mathematical errors Copying value to the wrong variable Incorrect assignment of constant values.

Chapter 3 Part 2 22

Debugging Logic Errors

Read through Section 3.8. Complete Tutorial 3-12 (pp. 162-167).

Set a breakpoint—line selected in code.

Chapter 3 Part 2 23

Checkpoints for Individual Review

page 144 pages 149 and 150 page 168

Answers at end of book

Chapter 3 Part 2 24

Additional Review

Summary Review Questions

Fill-in-the-blank True or False Multiple Choice Short Answer What Do You Think? Find the Error Algorithm Workbench

Answers on ftp site.