Download e-book for kindle: VB & VBA in a Nutshell: The Language by Paul Lomax

By Paul Lomax

ISBN-10: 1565923588

ISBN-13: 9781565923584

For visible easy and VBA programmers, this e-book boils down the necessities of the VB and VBA languages right into a unmarried quantity, together with undocumented and little-documented components necessary to daily programming. The handy alphabetical connection with all capabilities, strategies, statements, and key terms permits programmers to take advantage of this e-book either as a regular reference advisor and as a device for troubleshooting and opting for programming difficulties.

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In order for its subtype to be Null, a variable must have a Null value assigned to it explicitly, as in the following line of code: var1 = Null A Null value also results from any operation in which the value of one or more of the expressions is Null, as the following code fragment shows: dim myVarOne, myVarTwo, myVarThree 'All three variables are EMPTY now myVarOne = 9 myVarTwo=NULL 'We’ve made this variable NULL myVarThree = myVarOne + myVarTwo 'The result is NULL Error The Error subtype is used to store an error number.

The rows (or records) of the table represent the first dimension, and the columns (or fields) represent by the second dimension, as the following table illustrates. Record 1 Record 2 Field 1 Array Element (0,0) Field 2 Field 3 Array Element (0,2) Array Element(1,1) Array Variables VB & VBA in a Nutshell: The Language, eMatter Edition Copyright © 2000 O’Reilly & Associates, Inc. All rights reserved. info Array Variables Field 1 Record 3 Record 4 Field 2 Array Element (3,0) Field 3 Array Element (3,2) Multidimensional arrays can contain up to 60 dimensions, though it’s extremely rare to use more than two or three dimensions.

For more information, see the section about the Variant data type later in this chapter. Type Conversion VB & VBA in a Nutshell: The Language, eMatter Edition Copyright © 2000 O’Reilly & Associates, Inc. All rights reserved. 31 Variables & Data Types VBA provides two sets of built-in conversion functions. The first set, which includes Int and Str, is from the early versions of VB and is simply left in for backwards compatibility. The functions of the second set all start with the letter “C” and are the more recent conversion functions.

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VB & VBA in a Nutshell: The Language by Paul Lomax


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