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Full Discussion: Ascii value of character?
Top Forums UNIX for Dummies Questions & Answers Ascii value of character? Post 302234823 by sszd on Wednesday 10th of September 2008 11:56:51 AM
Old 09-10-2008
Quote:
Originally Posted by Ygor
Interesting. From info printf...
Quote:
* If the leading character of a numeric argument is `"' or `'' then
its value is the numeric value of the immediately following
character. Any remaining characters are silently ignored if the
`POSIXLY_CORRECT' environment variable is set; otherwise, a
warning is printed. For example, `printf "%d" "'a"' outputs `97'
on hosts that use the ASCII character set, since `a' has the
numeric value 97 in ASCII.
Quote:
Originally Posted by fpmurphy
From POSIX.1-2001 ..
Quote:
The argument operands will be treated as strings if the corresponding conversion character is b, c or s; otherwise, it will be evaluated as a C constant, as described by the ISO C standard, with the following extensions:

* If the leading character is a single- or double-quote, the value will be the numeric value in the underlying codeset of the character following the single- or double-quote.
Both of these seem to answer my question. None of the man pages (on Solaris 10) explained this with this kind of detail. Thank you.
 

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btowc(3C)																 btowc(3C)

NAME
btowc(), wctob() - conversion between single-byte and wide character SYNOPSIS
DESCRIPTION
The function determines whether c constitutes a valid (one-byte) character in the initial shift state. The function determines whether c corresponds to a member of the extended character set whose character representation is a sin- gle byte when in the initial shift state. APPLICATION USAGE
The prototypes of these functions are available to applications if they are: a. conformant. b. Compiled with the macro with a value >=500. c. Compiled with the macro with a value >= 200112. EXTERNAL INFLUENCES
Environment Variables The behavior of these functions is affected by the category. RETURN VALUE
The function returns if c has the value or if c as an unsigned character does not constitute a valid (one-byte) character in the initial shift state. Otherwise, it returns the wide character representation of that character. The function returns if c does not correspond to a character with length one in the initial shift state. Otherwise, it returns the single- byte representation of that character. ERRORS
No errors are defined. AUTHOR
was developed by HP and Mitsubishi Electric Corp. SEE ALSO
thread_safety(5). btowc(3C)
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