Mercurial > cpython-lru_cache-weakref
diff Doc/libstruct.tex @ 4866:3960340a3252 legacy-trunk
Describe standard float/double support.
Rewrite example to be an interactive session
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Fri, 03 Jan 1997 04:20:09 +0000 |
| parents | 38ae2a0fc4f3 |
| children | a9e7e0ccaa4a |
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--- a/Doc/libstruct.tex Fri Jan 03 00:26:28 1997 +0000 +++ b/Doc/libstruct.tex Fri Jan 03 04:20:09 1997 +0000 @@ -101,8 +101,8 @@ Standard size and alignment are as follows: no alignment is required for any type (so you have to use pad bytes); short is 2 bytes; int and -long are 4 bytes. In this mode, there is no support for float and -double (\code{'f'} and \code{'d'}). +long are 4 bytes. Float and double are 32-bit and 64-bit IEEE floating +point numbers, respectively. Note the difference between \code{'@'} and \code{'='}: both use native byte order, but the size and alignment of the latter is standardized. @@ -119,10 +119,14 @@ big-endian machine): \bcode\begin{verbatim} -from struct import * -pack('hhl', 1, 2, 3) == '\000\001\000\002\000\000\000\003' -unpack('hhl', '\000\001\000\002\000\000\000\003') == (1, 2, 3) -calcsize('hhl') == 8 +>>> from struct import * +>>> pack('hhl', 1, 2, 3) +'\000\001\000\002\000\000\000\003' +>>> unpack('hhl', '\000\001\000\002\000\000\000\003') +(1, 2, 3) +>>> calcsize('hhl') +8 +>>> \end{verbatim}\ecode Hint: to align the end of a structure to the alignment requirement of
