«

Hello. I am puzzled. A line of the form

char array[] = { a};

or

char array[] = { a, b, c};

is an array initializer.

_Except_

102$ cat try.c
#include <stdio.h>

int main ()
{
char ao[] = { "Hello" };
char at[] = { "Hello", "Goodbye." };

return 0;
} /* main */

103$ cc -W try.c
try.c: In function `main':
try.c:6: excess elements in char array initializer
try.c:6: (near initialization for `at')

Line 5 passes, but it should get the same error as line 6.

--
Michael Press

Michael Press wrote:
>
> Hello. I am puzzled. A line of the form
>
> char array[] = { a};
>
> or
>
> char array[] = { a, b, c};
>
> is an array initializer.
>
> _Except_
>
> 102$ cat try.c
> #include <stdio.h>
>
> int main ()
> {
> char ao[] = { "Hello" };
> char at[] = { "Hello", "Goodbye." };

char *at[] = { "Hello", "Goodbye." };

>
> return 0;
> } /* main */
>
> 103$ cc -W try.c
> try.c: In function `main':
> try.c:6: excess elements in char array initializer
> try.c:6: (near initialization for `at')
>
> Line 5 passes, but it should get the same error as line 6.

There's nothing wrong with line 5.

char ao[] = { "Hello" };
is shorthand for:
char ao[] = { 'H','e','l','l','o','\n'};

{ "Hello", "Goodbye." } is an initializer for an array of pointers.

--
pete

pete wrote:
>
> Michael Press wrote:
> >
> > Hello. I am puzzled. A line of the form
> >
> > char array[] = { a};
> >
> > or
> >
> > char array[] = { a, b, c};
> >
> > is an array initializer.
> >
> > _Except_
> >
> > 102$ cat try.c
> > #include <stdio.h>
> >
> > int main ()
> > {
> > char ao[] = { "Hello" };
> > char at[] = { "Hello", "Goodbye." };
>
> char *at[] = { "Hello", "Goodbye." };
>
> >
> > return 0;
> > } /* main */
> >
> > 103$ cc -W try.c
> > try.c: In function `main':
> > try.c:6: excess elements in char array initializer
> > try.c:6: (near initialization for `at')
> >
> > Line 5 passes, but it should get the same error as line 6.
>
> There's nothing wrong with line 5.
>
> char ao[] = { "Hello" };
> is shorthand for:
> char ao[] = { 'H','e','l','l','o','\n'};

Excuse me. I meant

char ao[] = { 'H','e','l','l','o','\0'};


--
pete

Michael Press <> wrote in news:jack-B9EA52.19181703102005
@newsclstr02.news.prodigy.com:

> Hello. I am puzzled. A line of the form
>
> char array[] = { a};

Well, no. Either

char array[] = { 'a' };

or,

char array[] = "a";

> char array[] = { a, b, c};

Similarly:

char array[] = { 'a', 'b', 'c', };

> 102$ cat try.c
> #include <stdio.h>
>
> int main ()
> {
> char ao[] = { "Hello" };

The RHS is an array of char *.

So,

char *ao[] = { "Hello" };

> char at[] = { "Hello", "Goodbye." };

char *at[] = { "Hello", "Goodbye.", };

/* --- */
#include <stdio.h>

int main () {
size_t i;
char ac[] = { 'H', 'e', 'l', 'l', 'o', };
char *at[] = { "Hello", "Goodbye.", "etc" };
for (i = 0; i != sizeof(at)/sizeof(at[0]); ++i) {
puts(at[i]);
}
for (i = 0; i != sizeof(ac); ++i) {
printf("%c\n", ac[i]);
}
return 0;
}
/* --- */

Sinan

--
A. Sinan Unur <>
(reverse each component and remove .invalid for email address)

comp.lang.perl.misc guidelines on the WWW:
http://mail.augustmail.com/~tadmc/cl...uidelines.html

pete <> wrote:

> char ao[] = { "Hello" };
> is shorthand for:
> char ao[] = { 'H','e','l','l','o','\n'};
^^^^
ITYM '\0', presumably?

--
Christopher Benson-Manica | I *should* know what I'm talking about - if I
ataru(at)cyberspace.org | don't, I need to know. Flames welcome.

A. Sinan Unur wrote:
>
> Michael Press <> wrote in news:jack-B9EA52.19181703102005

> > #include <stdio.h>
> >
> > int main ()
> > {
> > char ao[] = { "Hello" };
>
> The RHS is an array of char *.

It can be, but it isn't.

/* BEGIN new.c */

#include <stdio.h>

int main(void)
{
char ao[] = { "Hello" };
char *at[] = { "World" };

puts(ao );
puts(at[0]);
return 0;
}

/* END new.c */

--
pete

Christopher Benson-Manica wrote:
>
> pete <> wrote:
>
> > char ao[] = { "Hello" };
> > is shorthand for:
> > char ao[] = { 'H','e','l','l','o','\n'};
> ^^^^
> ITYM '\0', presumably?

Yes.

--
pete

pete <> wrote in news::

> A. Sinan Unur wrote:
>>
>> Michael Press <> wrote in news:jack-B9EA52.19181703102005
>
>> > #include <stdio.h>
>> >
>> > int main ()
>> > {
>> > char ao[] = { "Hello" };
>>
>> The RHS is an array of char *.
>
> It can be, but it isn't.
>

Yes. I had meant to put that comment further below. Sorry about that.

Sinan

--
A. Sinan Unur <>
(reverse each component and remove .invalid for email address)

pete <> wrote:

> Yes.

I saw your correction after I posted mine. My apologies.

--
Christopher Benson-Manica | I *should* know what I'm talking about - if I
ataru(at)cyberspace.org | don't, I need to know. Flames welcome.

In article <>,
pete <> wrote:

> Michael Press wrote:
> >
> > Hello. I am puzzled. A line of the form
> >
> > char array[] = { a};
> >
> > or
> >
> > char array[] = { a, b, c};
> >
> > is an array initializer.
> >
> > _Except_
> >
> > 102$ cat try.c
> > #include <stdio.h>
> >
> > int main ()
> > {
> > char ao[] = { "Hello" };
> > char at[] = { "Hello", "Goodbye." };
>
> char *at[] = { "Hello", "Goodbye." };
>
> >
> > return 0;
> > } /* main */
> >
> > 103$ cc -W try.c
> > try.c: In function `main':
> > try.c:6: excess elements in char array initializer
> > try.c:6: (near initialization for `at')
> >
> > Line 5 passes, but it should get the same error as line 6.
>
> There's nothing wrong with line 5.
>
> char ao[] = { "Hello" };
> is shorthand for:
> char ao[] = { 'H','e','l','l','o','\n'};

Where does the standard say this?

"Hello"

evaluates to a pointer to char.

> { "Hello", "Goodbye." } is an initializer for an array of pointers.

Yes, I know this.

I assert that there is something wrong with line 5. An
item in an initializer-list to an array of char should
evaluate to a char, and "Hello" does not evaluate to a
char.

I do not have at hand a Backus-Naur grammar for C; only
K&R 1st edition, and it does not allow the initializer

char ao[] = { "Hello" };

Can anyone point me at an up to date Backus-Naur grammar
for C?

To be more plain

char at[] = { "Hello", "Goodbye." };

is manifestly incorrect, but

char ao[] = { "Hello" };

is incorrrect by the same reasoning.

?

--
Michael Press