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VB
Script Variables |
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| Definition:
is a section of memory that is allocated a name by the
programmer. |
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| Syntax: |
| DIM
variablename |
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| Examples: |
DIM
strName
DIM strAddress, strCity, intTelephone
strName = "John"
strAddress = "248 Somewhere St"
strCity = "New York"
intTelephone = 4164527854 |
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| In
VB Script all variables are created with the data type
variant. A variant is a special data type,
it will change to different data types depending on the
data it is holding. If for example strName = "John"
it will be a string. If trying to set a variable equal
to a date use # around the value. Example DateTime = #12/10/2001# |
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| The
some different subtypes that the variant data type may
act like: |
| Subtypes |
Description |
| Byte |
Whole
number in the range of 0 to 255 |
| Integer |
Whole
number in the range -32,768 to 32,767 |
| Long |
Whole
number in the range 2,147,483,648 to 2,147,483,647 |
| Single |
Single-precision
floating-point number with 6 digits of accuracy |
| Double |
Double-precision
floating-point number with 14 digits of accuracy |
| Currency |
Decimal
Fractions, such as dollars and cents |
| Date |
An
eight-character date |
| Boolean |
True
or False values |
| String |
Alphanumeric
data: letters, digits and other characters |
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| Some
functions to use to determine the type of data held by
a variable: |
| Function |
Description |
| TypeName(variable) |
Will
return the subtype of a variable.
If a variable is holding a string it will return
"String"
If a variable is holding a double it will return
a "Double" |
| isnumeric(variable) |
If
the value in a variable is numeric it returns "True"
else "False"
Note: Even if the variable subtype
is a string but the string's value is a number it
will return "True" |
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| Some
Data Type Conversion Functions: |
| Function |
Description |
| Abs |
Returns
the absolute value of a number. |
| Asc |
Returns
the ANSI character code of a character. |
| Chr |
The
opposite of Asc. Returns a character from a ANSI
character code. |
| CBool |
Converts
a variable into a Boolean subtype. |
| CByte |
Converts
a variable into a Byte subtype. |
| CCur |
Converts
a variable into a Currency subtype. |
| CDate |
Converts
a variable into a Date subtype. |
| CDbl |
Converts
a variable into a Double subtype. |
| CInt |
Converts
a variable into a Integer subtype. |
| CLng |
Converts
a variable into a Long subtype. |
| CSng |
Converts
a variable into a Single subtype. |
| CStr |
Converts
a variable into a String subtype. |
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