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ID: 13767, Exploring Numbers, Not-A-Number (NaN), and Infinity (INF)

by Earl F. Glynn Email:

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For Delphi, Version 3.0  to 4.0 446 downloads
Copyright: Commercial use requires permission

Size: 165,328 bytes
Updated on Tue, 17 Aug 1999 00:00:00 GMT
Originally uploaded on Tue, 17 Aug 1999 00:00:00 GMT
SHA1 Hash: 1D5B6D60226934A8BBC1B4CEA428AF468215D594
MD5 Hash: 58A08050B3DAEA202677E8DA9466528E

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In this Tech Note (NaN.htm), you'll discover how to create and use a NaN (not-a-number) and INF (infinity) values in your Delphi mathematical calculations with the help of the new Int64 feature in Delphi 4. The Tech Note also reviews some of the changes related to numbers introduced in Delphi 4.

First appeared in the October 1998 "Delphi Developer," pp. 9-14. Appearing here with updates and additions.

- Ordinal Types
- Real Types
- When a Real is Actually an Integer
- IEEE 754-1985
- "Quiet" vs. "Signaling" NaNs
- Other Examples of Handling Exceptions
- Mean and Standard Deviation Example
- Conclusions
- Postscript

The "home" of this Tech Note is:

Keywords: NaN, INF, ShortInt, Byte, SmallInt, Word, LongWord, LongInt, Int64, LongLong, Integer, Cardinal, Single, Real48, Double, Extended, Comp, Currency, IEEE 754-1985, Normal, Subnormal, Quiet NaN, Signaling NaN, Absolute keyword, DoubleToHex, HexToDouble, IsInfinity, IsNaN, MeanAndStandardDeviation procedure, EZeroDivide, EInvalidOp

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