Spring 2006

1
Tutorial 14 16

• Spring 2006
• INFS 308

2
Overview

• Date variables
• Datetimepicker
• Timers
• Random Numbers
• Enumerated types
• Namespaces

3
Date Variables

• DateTimePicker
• Dim dtmMytime as Date New Date(2003,1,1,0,0,0)
• Date structure (properties)
• Date(year, month, day, hour, minute, second)
• Implies
• dtmMytime.year dtmMytime.second
• Date methods (addHours, AddDays, etc.)
• dtmMytime.AddHours (integer)
• Custom date format
• hhmmss tt
• Up-Down Arrows what happens here?

4
Timers

• Timer
• Enabled interval
• Uses Component Tray
• Setting is in what fraction of seconds?
• Tick event

5
Random Numbers

• Object class random
• Dim objRandom as Random New Random
• Use new to create Can use .Next method
• Dim myRanNum As Integer objRandom.Next()
• Set the range
• Intmyint objRandom.next(6)
• Intmyint objRandom.next(1,7)
• Dblmydbl objRandom.nextdouble() 6
• What is the range of each variable?

6
Enumerated Types

• Declare set of variables and their order
• Example
• Enum Suites
• Diamonds 1
• Clubs 2
• Hearts 3
• Spades 4
• End Enum
• Can be used in case statements

The enumeration puts an precedence order to the
names. Spades gt Hearts
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Namespaces

• Collections of methods
• Example
• Imports System.IO
• Goes above Public Class declaration in code
• Directory.GetCurrentDirectoy provides current
  directory where program is running