add C23

Author: vladak

intro.tex

@@ -466,6 +466,12 @@
 \url{http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf}.
 \item After C99, C11 came, officially ISO/IEC 9899:2011. And then C17,
 a bug fix standard, in 2018, officially ISO/IEC 9899:2018.
+\item The current version of the standard is C23, published in 2024. It
+addresses many deficiencies in the older versions and adds a pack of new features.
+Notable changes/additions: \texttt{0b}/\texttt{0B} prefixes and related
+\texttt{\%b} format string to specify and operate on binary representations.
+Many new keywords, e.g. the \texttt{static\_assert} keyword. Various memory
+alignment functions, keywords. The \texttt{typeof} operator.
 \item Some difference between C89 and C99 -- inline functions, variable
 definitions intermixed with code, one-line comments using \texttt{//}, new
 functions like \funnm{snprintf}() etc.