#Vba integer overflow 32 bit
Note that since a Long matches the width of a pointer in a 32 bit operating system, Longs are commonly used for storing and passing pointers to and from API functions. Longs are stored in memory as little-endian values with negatives represented as a two's complement. It can store integer numbers in the range of -2,147,483,648 to 2,147,483,647 and attempting to store a value outside of that range will result in runtime error 6: Overflow. Even though it is represented internally as a 16 bit number, casting to a Boolean from values outside of that range is safe from overflow, although it sets all 16 bits to 1: Dim Example As BooleanĪ Long is a signed 32 bit data type. The casting function to convert to a Boolean is CBool(). This results in an internal representation of -1 for signed types and the maximum value for an unsigned type (Byte). It should be noted that when a Boolean is cast to a numeric type, all of the bits are set to 1. Internally, the data type is stored as a 16 bit value with 0 representing False and any other value representing True. Boolean Dim Value As BooleanĪ Boolean is used to store values that can be represented as either True or False. For casts from floating point types, the result is rounded to the nearest integer value with. The casting function to convert to an Integer is CInt().
Additionally, there is a performance penalty incurred every time an Integer type is used as it is silently cast as a Long. In most cases VBA treats Integers as 32 bit internally, so there is usually no advantage to using the smaller type. Note that in general, it is better practice to use a Long rather than an Integer unless the smaller type is a member of a Type or is required (either by an API calling convention or some other reason) to be 2 bytes.
Integers are stored in memory as little-endian values with negatives represented as a two's complement. It can store integer numbers in the range of -32,768 to 32,767 and attempting to store a value outside of that range will result in runtime error 6: Overflow. Str = ChrW(&H2123) & "." ' Versicle character and a dotĭebug.Print byt(0), byt(1), byt(2), byt(3) ' Prints: 35,33,46,0Īn Integer is a signed 16 bit data type. In order to be able to encode Unicode characters, each character in the string takes up two bytes in the array, with the least significant byte first. Strings and byte arrays can be substituted for one another through simple assignment (no conversion functions necessary). The casting function to convert to a Byte is CByte(). Byte is the only intrinsic unsigned type available in VBA. It can represent integer numbers between 0 and 255 and attempting to store a value outside of that range will result in runtime error 6: Overflow. Working With Files and Directories Without Using FileSystemObjectĪ Byte is an unsigned 8 bit data type.String Literals - Escaping, non-printable characters and line-continuations.
Searching within strings for the presence of substrings.Reading 2GB+ files in binary in VBA and File Hashes.Macro security and signing of VBA-projects/-modules.Automation or Using other applications Libraries.Assigning strings with repeated characters.
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