Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.c > #109566

Re: error: initializer element is not constant|

Show all headers | View raw

Il 08/05/2017 13:02, bartc ha scritto:
> On 08/05/2017 11:18, jak wrote:
>
>> I would like to create an array of pointers, of pointers to strings. In
>> this way I can have the pointers as constant and I wrote this:
>>
>> char *Date = "01-01-80";
>>
>> typedef char * ch;
>> typedef ch * p_ch;
>>
>> p_ch foo[] =
>> {
>>   &Date,
>>   (p_ch)&"Date"
>> };
>>
>> This works but I do not know how to declare foo without using typedef.
>
> Those types would look like this without typedefs:
>
> char *  str;
> char *  array_of_str[];
> char ** ptr_to_str;
> char ** array_of_ptr_to_str[];
>
> (The arrays will need a dimension, or need to be initialised.)
>
> But arrays of pointers to strings would be unusual, and be harder to
> initialise as you can't just have "ABC", but need to set up a named
> string: char* abc="ABC", then use &abc.
>
> I don't think you can apply a cast to "ABC" to get the pointer you need.
> (Well, you can cast it, but it won't be a proper pointer to string,
> it'll just be a string, and will crash when you apply the dereference
> below.)
>
> Using the array would be harder too as you'll need an extra dereference
> to extract the string:
>
>    puts(*array_of_ptr_to_str[0]);
>
Ok ok. Bugs have also been put in the middle. The first time I wrote the 
declaration in this way:

char *Date = "01-01-80";
char **Phrases[]
{
    &Date
}

and gcc gave me a lot of errors. For this reason I chosed the way of 
typedefs. Later closed CodeBlocks and reopened it, and also this 
statement worked. :(

Now I'm using this work around:


char *Phrases[]
{
    "Date: ",
    NULL,
    "\r\n"
};
char **DatePos = Phrases[1];

foo()
{
    *DatePos = ctime(&t);
    *DatePos[strlen(Date) - 1] = '\0';
}

But I still do not understand why the compiler does not allow me this:

char *Date = NULL;
char *Phrases[]
{
    "Date: ",
    Date,
    "\r\n"
};

In the end I'm just asking him to allocate space to write in an address 
exactly as it happens when I write NULL instead of 'Date'.

Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

error: initializer element is not constant| jak <please@nospam.tnx> - 2017-05-08 09:55 +0200
  Re: error: initializer element is not constant| jak <please@nospam.tnx> - 2017-05-08 10:05 +0200
  Re: error: initializer element is not constant| Noob <root@127.0.0.1> - 2017-05-08 10:38 +0200
    Re: error: initializer element is not constant| jak <please@nospam.tnx> - 2017-05-08 11:55 +0200
      Re: error: initializer element is not constant| bartc <bc@freeuk.com> - 2017-05-08 11:01 +0100
        Re: error: initializer element is not constant| jak <please@nospam.tnx> - 2017-05-08 12:18 +0200
          Re: error: initializer element is not constant| bartc <bc@freeuk.com> - 2017-05-08 12:02 +0100
            Re: error: initializer element is not constant| Keith Thompson <kst-u@mib.org> - 2017-05-08 09:00 -0700
              Re: error: initializer element is not constant| bartc <bc@freeuk.com> - 2017-05-08 17:50 +0100
                Re: error: initializer element is not constant| Keith Thompson <kst-u@mib.org> - 2017-05-08 11:37 -0700
                Re: error: initializer element is not constant| bartc <bc@freeuk.com> - 2017-05-08 19:49 +0100
                Re: error: initializer element is not constant| Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-05-08 20:13 +0100
                Re: error: initializer element is not constant| Keith Thompson <kst-u@mib.org> - 2017-05-08 12:44 -0700
                Re: error: initializer element is not constant| scott@slp53.sl.home (Scott Lurndal) - 2017-05-08 20:24 +0000
            Re: error: initializer element is not constant| jak <please@nospam.tnx> - 2017-05-09 09:54 +0200
              Re: error: initializer element is not constant| jak <please@nospam.tnx> - 2017-05-09 10:15 +0200
              Re: error: initializer element is not constant| GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-09 12:12 +0200
              Re: error: initializer element is not constant| bartc <bc@freeuk.com> - 2017-05-09 11:47 +0100
                Re: error: initializer element is not constant| jak <please@nospam.tnx> - 2017-05-09 19:06 +0200
                Re: error: initializer element is not constant| scott@slp53.sl.home (Scott Lurndal) - 2017-05-09 17:10 +0000
                Re: error: initializer element is not constant| jak <please@nospam.tnx> - 2017-05-09 19:20 +0200
                Re: error: initializer element is not constant| Barry Schwarz <schwarzb@dqel.com> - 2017-05-09 10:35 -0700
                Re: error: initializer element is not constant| jak <please@nospam.tnx> - 2017-05-09 20:04 +0200
                Re: error: initializer element is not constant| Keith Thompson <kst-u@mib.org> - 2017-05-09 11:57 -0700
                Re: error: initializer element is not constant| supercat@casperkitty.com - 2017-05-09 12:50 -0700
                Re: error: initializer element is not constant| Keith Thompson <kst-u@mib.org> - 2017-05-09 12:54 -0700
                Re: error: initializer element is not constant| bartc <bc@freeuk.com> - 2017-05-09 20:15 +0100
                Re: error: initializer element is not constant| "James R. Kuyper" <jameskuyper@verizon.net> - 2017-05-09 14:13 -0400
                Re: error: initializer element is not constant| Keith Thompson <kst-u@mib.org> - 2017-05-09 11:41 -0700
              Re: error: initializer element is not constant| Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-05-09 12:16 +0100
              Re: error: initializer element is not constant| Keith Thompson <kst-u@mib.org> - 2017-05-09 08:11 -0700
          Re: error: initializer element is not constant| Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-05-08 12:12 +0100
            Re: error: initializer element is not constant| bartc <bc@freeuk.com> - 2017-05-08 13:45 +0100
              Re: error: initializer element is not constant| Keith Thompson <kst-u@mib.org> - 2017-05-08 09:04 -0700
              Re: error: initializer element is not constant| Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-05-08 19:53 +0100
                Re: error: initializer element is not constant| bartc <bc@freeuk.com> - 2017-05-08 20:44 +0100
                Re: error: initializer element is not constant| Noob <root@127.0.0.1> - 2017-05-09 09:27 +0200
              Re: error: initializer element is not constant| Tim Rentsch <txr@alumni.caltech.edu> - 2017-05-09 07:10 -0700
            Re: error: initializer element is not constant| Keith Thompson <kst-u@mib.org> - 2017-05-08 09:30 -0700
  Re: error: initializer element is not constant| John Bode <jfbode1029@gmail.com> - 2017-05-08 08:05 -0700

csiph-web