At 6/18/2007 08:20 PM, you wrote:
>Rick <[EMAIL PROTECTED]> wrote:
> > you wrote:
> > > Rick <Mowgli53@> wrote:
> > > >
> > > > in C:
> > > >
> > > > #include <stdio.h>
> > > > #include <stdlib.h>
>
><stdlib.h> is not needed.
>
> > > > int main(int argc, char *argv[])
>
>Simplify to...
>
> int main(void)
>
> > > > {
> > > > char *s="\12345s\n";
> > > > printf("sizeof(s) is %d\n",sizeof(s));
>
>See below.
>
> > > > printf("s= 0x%02x (octal %o), 0x%02X (char %c), 0x%02X" \
>
>The \ is not needed. Note that \ is translated long before
>string literals are concatenated.
>
> > > > "(char %c), 0x%02X (char %c) 0x%02X (octal %o)\n",
> > > > s[0], s[0], s[1], s[1], s[2], s[2], s[3], s[3], s[4], s[4]);
> > > >
> > > > system("PAUSE");
>
>I take it you don't like *nix environments. ;)
>
> > > > return 0;
> > > > }
> > >
> > > why do you expect sizeof(s) to be 5?
>
>Good question.
>
> > > s is a char*, not a char[].
>
>Not relevant.
>
> > Doh! You are so right! What was I thinking???
> >
> > Thank you for waking me up.
>
>Since Nico has got you out of bed, perhaps I can serve some
>coffee and toast. ;)
>
>Firstly, char *s="\12345s\n";, is analogous to...
>
> static const char blah[] = { 0123, '4', '5', 's', '\n', 0 };
> char *s = blah;
>
>Octal character escapes are limited to 3 digits. The
>static string literal reserves 6 characters, not 5.
>
>As an aside, hex (\x) escapes are not bounded to any
>number of digits, so...
>
> "\x0dAbout last night!"
>
>...is not the same as...
>
> "\x0d" "About last night!"
>
>It's actually the same as...
>
> "\x0dab" "out last night!"
>
>...where \x0dab is a single character!
>
>To avoid a similar issue to hex escape sequences,
>programmers often write \012, rather than \12, not
>because an octal escape needs a leading zero (it doesn't),
>but because it makes it less likely for problems arising
>if the next character is a literal digit that happens to
>be an octal digit.
>
>Secondly, sizeof returns a size_t which is an unsigned
>type that need not be compatible with %d.
>
>Even on systems where it doesn't crash, your code may
>well print "sizeof(s) is 0" for unsurprising reasons.
>
>C99 (and many glibc implementations) support %zu for
>printing size_t values. C90 programmers often use
>%u or %lu and cast the size_t argument.
>
>--
>Peter
Thank you, Peter, for the detailed explanation.
I am aware of almost everything you wrote. I simply put together a
very quick program to respond to the OP's question.
Actually, I _prefer_ *NIX systems, but I used Dev C++ on Windows to
create the program. Dev C++ automatically includes the "<stdlib.h>",
"int main(int argc, char *argv[])" and "system("PAUSE");" lines.
I didn't take the time to make a solid program, just a
quick-and-dirty example for the OP.
~Rick
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