Microsoft Visual Basic 2010 Step by Step eBook

136 Part II Programming Fundamentals

TABLE 5-1 Fundamental Data Types in Visual Basic

Data Type Size Range Sample Usage

Short 16-bit –32,768 through 32,767 Dim Birds As Short^

Birds = 12500

UShort 16-bit 0 through 65,535 Dim Days As UShort^

Days = 55000

Integer 32-bit –2,147,483,648 through

2,147,483,647

Dim Insects As Integer

Insects = 37500000

UInteger 32-bit 0 through 4,294,967,295 Dim Joys As UInteger^

Joys = 3000000000

Long 64-bit –9,223,372,036,854,775,808 to

9,223,372,036,854,775,807

Dim WorldPop As Long

WorldPop = 4800000004

ULong 64-bit 0 through

18,446,744,073,709,551,615

Dim Stars As ULong

Stars = _

1800000000000000000

Single 32-bit

floating point

–3 .4028235E38 through

3 .4028235E38

Dim Price As Single

Price = 899.99

Double 64-bit

floating point

–1 .79769313486231E308 through

1 .79769313486231E308

Dim Pi As Double

Pi = 3.1415926535

Decimal 128-bit 0 through +/–79,228,162,514,264,

337,593,543,950,335

(+/–7 .9... E+28) with no

decimal point; 0 through +/–

7 .9228162514264337593543950335

with 28 places to the right of the

decimal. Append “D” if you want

to force Visual Basic to initialize a

Decimal.

Dim Debt As Decimal

Debt = 7600300.5D

Byte 8-bit 0 through 255 (no negative

numbers)

Dim RetKey As Byte

RetKey = 13

SByte 8-bit –128 through 127 Dim NegVal As SByte^

NegVal = – 20

Char 16-bit Any Unicode symbol in the range

0–65,535. Append “c” when

initializing a Char.

Dim UnicodeChar As Char

UnicodeChar = "Ä"c

String Usually 16-bits

per character

0 to approximately 2 billion

16-bit Unicode characters

Dim Dog As String

Dog = "pointer"

Boolean 16-bit True or False. (During conversions,

0 is converted to False, other values

to True .)

Dim Flag as Boolean

Flag = True

Date 64-bit January 1, 0001, through

December 31, 9999

Dim Birthday as Date

Birthday = #3/1/1963#

Object 32-bit Any type can be stored in a variable

of type Object.

Dim MyApp As Object

MyApp = CreateObject _

("Word.Application")