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Excel-specific data structuresįP – a two-dimensional floating-point array structure supporting up to 65,356 rows by the maximum number columns supported in the given version of Excel. In this case, any non-zero input is converted to 1, and zero is passed straight through. The exception is when you are registering a function to take a Boolean argument, implemented using short int. Where you are using integer types, Excel verifies that the inputs are within the limits of the type, and they fail with #NUM! if outside these. unsigned short * – Unicode strings of up to 32,767 characters, which can be null-terminated or length-countedĪll worksheet numbers in Excel are stored as doubles so that it is not necessary (and in fact introduces a small conversion overhead) to declare add-in functions as exchanging integer types with Excel.Unsigned char * – length-counted byte strings of up to 255 characters char * – null-terminated byte strings of up to 255 characters short – used for Boolean values and also integers These are mentioned here to provide a context for other sections, and they are discussed in detail in the xlfRegister (Form 1) topic. Microsoft Excel exchanges several ANSI C/C++ types and also some Excel-specific data structures. Applies to: Excel 2013 | Office 2013 | Visual Studio