[Cfp-interest] D/d double type floating point suffix

[Ian McIntosh]

Packed decimal is fixed-point, not floating-point. The hardware treats it
as integers, but from a software point of view it's usually not integer.
For example, financial calculations might have 15 digits treated as 13
before the decimal point and 2 after.  In mainframe C a value of that type
might look like 123.45d.

To complicate things, passing a literal parameter might need the leading
zeros or a cast to the right size, because 123.45 and 0000000000123.45 are
actually different types - 3+2=5 digits and 13+2=15 digits.

- Ian McIntosh          IBM Canada Lab         Compiler Back End Support
and Development



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  |"Fred J. Tydeman" <tydeman at tybor.com>                                                                                                             |
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  |"CFP" <cfp-interest at ucbtest.org>                                                                                                                  |
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  |07/30/2012 10:06 AM                                                                                                                               |
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  |Re: [Cfp-interest] D/d double type floating point suffix                                                                                          |
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  |cfp-interest-bounces at oakapple.net                                                                                                                 |
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My understanding is that the 'd' suffix is used on packed decimal
constants.  In the hardware, they are integers.  But, in the
user's source code, can they look like floating-point numbers?
That is, would 1.00d be a valid packed decimal constant?

---
Fred J. Tydeman        Tydeman Consulting
tydeman at tybor.com      Testing, numerics, programming
+1 (775) 287-5904      Vice-chair of PL22.11 (ANSI "C")
Sample C99+FPCE tests: http://www.tybor.com
Savers sleep well, investors eat well, spenders work forever.

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