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| author | Guido van Rossum <guido@python.org> | 1997-01-03 04:20:09 (GMT) |
|---|---|---|
| committer | Guido van Rossum <guido@python.org> | 1997-01-03 04:20:09 (GMT) |
| commit | dbadd558b5de96ecff74218d44e15515a635b785 (patch) | |
| tree | 2468bd76864584ac04b606cba4b65bac680dfa3f | |
| parent | b9a781e177ace3ef32fa40a98f0792432ec9fdd3 (diff) | |
| download | cpython-dbadd558b5de96ecff74218d44e15515a635b785.zip cpython-dbadd558b5de96ecff74218d44e15515a635b785.tar.gz cpython-dbadd558b5de96ecff74218d44e15515a635b785.tar.bz2 | |
Describe standard float/double support.
Rewrite example to be an interactive session
| -rw-r--r-- | Doc/lib/libstruct.tex | 16 | ||||
| -rw-r--r-- | Doc/libstruct.tex | 16 |
2 files changed, 20 insertions, 12 deletions
diff --git a/Doc/lib/libstruct.tex b/Doc/lib/libstruct.tex index f29d83c..6431ca5 100644 --- a/Doc/lib/libstruct.tex +++ b/Doc/lib/libstruct.tex @@ -101,8 +101,8 @@ expression. This is always combined with native byte order. 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 @@ Examples (all using native byte order, size and alignment, on a 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 diff --git a/Doc/libstruct.tex b/Doc/libstruct.tex index f29d83c..6431ca5 100644 --- a/Doc/libstruct.tex +++ b/Doc/libstruct.tex @@ -101,8 +101,8 @@ expression. This is always combined with native byte order. 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 @@ Examples (all using native byte order, size and alignment, on a 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 |