What VB Script keyword is used to formally declare a variable used by the script before trying to use it?

*NOTE*: The answer to your above question is to use the DIM statement...which means DIMension; you use it to formally declare VBScript variables *before* using them; and, this is meant to set aside sufficient memory space to use the variable in.

EXAMPLE 1/VBScript code...

DIM intX

DIM intY

DIM intTotal

intX=1

intY=2

intTotal=intX+intY

MsgBox(intTotal)

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The way to make absolutely certain that each variable has already been declared *before* using it...is to use the Option Explicit statement which is usually written at the start of the program...

EXAMPLE 2a/VBScript code...

Option Explicit

DIM intX

DIM intY

DIM intTotal

intX=1

intY=2

intTotal=intX+intY

MsgBox(intTotal)

intZ=2

MsgBox(2)

...in this case, the program stops when it reaches the variable called: intZ; complaining that this variable is 'undeclared'.

If you were to add DIM intZ...*before* using the variable name...then, the program should work ok; as in the following example.

EXAMPLE 2b/VBScript code

Option Explicit

DIM intX

DIM intY

DIM intZ

DIM intTotal

intX=1

intY=2

intTotal=intX+intY

MsgBox(intTotal)

intZ=2

MsgBox(2)

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Finally, this last example shows that you can use the DIM statement to declare not only a 'single' variable, alone, on each line; but, you can also use it in a more compact form by declaring 'multiple' variables all being written on the one same line; with each of these variables being seperated by a comma.

EXAMPLE 3/VBScript code...

Option Explicit

DIM intX,intY,intZ,intTotal

intX=1

intY=2

intTotal=intX+intY

MsgBox(intTotal)

intZ=2

MsgBox(2)