Correct Typedef

[Priya Mishra]

What is wrong in the below code,
I get the 2 error when i compile the prog... what is mean ??


error C2275: structure: illegal use of this type as an expression
error C2065: str: undeclared identifier


typedef struct
{
char file;
int a;
int b;
int c;



} structure;


int func(structure *Ob,
char *fileName);

int main(int argc, char **argv )
{


int error;
structure *str;


error = func(&str, "abc.txt");


return error;
}

Thanks
Priya

[Suman]

Re: Correct Typedef

Priya Mishra wrote:[color=blue]
> What is wrong in the below code,
> I get the 2 error when i compile the prog... what is mean ??
>
>
> error C2275: structure: illegal use of this type as an expression
> error C2065: str: undeclared identifier[/color]
Does that mean you are using VC++? Use a C compiler, will you, please?[color=blue]
>[/color]
#include <stdio.h>[color=blue]
>
> typedef struct
> {
> char file;
> int a;
> int b;
> int c;
>
>
>
> } structure;[/color]
A struct without a tag, and typedef'ing is okay on C compilers.[color=blue]
>
>
> int func(structure *Ob,
> char *fileName);
>
> int main(int argc, char **argv )[/color]
Don't need the argc & argv if you are not going to use them, so
int main(void) works.[color=blue]
> {
>
>
> int error;
> structure *str;[/color]
IMHO, you are trying to retrieve some information
about some file (assuming the function declaration is sane.)
Surely you need some memory allocated here?
Or, atleast a valid pointer.[color=blue]
>
>
> error = func(&str, "abc.txt");[/color]
err: func takes pointer to struct, str, is a pointer to pointer to
struct.[color=blue]
>
>
> return error;
> }
>[/color]

[Suman]

Re: Correct Typedef



Priya Mishra wrote:[color=blue]
> What is wrong in the below code,
> I get the 2 error when i compile the prog... what is mean ??
>
>
> error C2275: structure: illegal use of this type as an expression
> error C2065: str: undeclared identifier[/color]
FYI:
On copy-pasting the code in MSVC++ 6
I did not get such an error, what I got was some other error,
in your passing a wrong argument to func. So maybe you can explain
a bit more about whether this is the only piece of code you tried
compiling or not...
[snip]

[Suman]

Re: Correct Typedef



Priya Mishra wrote:[color=blue]
> What is wrong in the below code,
> I get the 2 error when i compile the prog... what is mean ??
>
>
> error C2275: structure: illegal use of this type as an expression
> error C2065: str: undeclared identifier
>
>
> typedef struct
> {
> char file;
> int a;
> int b;
> int c;
>
>
>
> } structure;
>
>
> int func(structure *Ob,
> char *fileName);
>
> int main(int argc, char **argv )
> {
>
>
> int error;
> structure *str;
>
>
> error = func(&str, "abc.txt");
>
>
> return error;
> }
>
> Thanks
> Priya[/color]

If I am not too wrong, there was another thread with the exact same
content,
poster's name etc. Usenet is not instant coffee, give it some time
before recreating
a thread. It is possible that your thread gets lost, but that is a
rarety. I have already
replied to the other, and it is indeed irritating to find same content
elsethread.

[Mehta Shailendrakumar]

Re: Correct Typedef

change
error = func(&str, "abc.txt");
to
error = func(str, "abc.txt");

it should work


"Priya Mishra" <mis.priya@gmai l.com> wrote in message
news:1121243300 .894522.131940@ g47g2000cwa.goo glegroups.com.. .[color=blue]
> What is wrong in the below code,
> I get the 2 error when i compile the prog... what is mean ??
>
>
> error C2275: structure: illegal use of this type as an expression
> error C2065: str: undeclared identifier
>
>
> typedef struct
> {
> char file;
> int a;
> int b;
> int c;
>
>
>
> } structure;
>[/color]

[Neeraj Gupta]

Re: Correct Typedef

Hi,

I could figure out two problems with the code:
1. You were trying to make a fn call without the function definition.
2. The fn call should be made with only "str" and NOT "&str"

This snippet should work:
#include <malloc.h>

typedef struct
{
char file;
int a;
int b;
int c;



} structure;


int func(structure *Ob,
char *fileName)
{
return 0;
}

int main(int argc, char **argv )
{


int error;
structure *str;
str = (structure *)malloc(sizeof (structure));

error = func(str, "abc.txt");


return error;

}

[vsnadagouda@gmail.com]

Re: Correct Typedef

Hello Priya,

str is a pointer to "structure" type. If you want a pointer to this
poniter, then the receiving end should be a pointer to pointer to
"structure" type.(structure **Ob)

So your program looking like:

typedef struct
{
char file;
int a;
int b;
int c;



} structure;


int func(structure **Ob,
char *fileName);

int main(int argc, char **argv )
{


int error;
structure *str;


error = func(&str, "abc.txt");


return error;



}

But, be aware of the uninitialized pointers, like 'str'.

Cheers
-Vallabha

[Seven Kast USA]

Re: Correct Typedef

READ ANY ONE C BOOK .. .I T WILL EXPLAIN U ......DONT COME POST
MESSAGE IN USER NET

[Ken]

Re: Correct Typedef

Hi,

All errors were due to the definition of structure. Try this:

typedef struct _structure
{
char file;
int a;
int b;
int c;
} structure;

[noblesantosh@yahoo.com]

Re: Correct Typedef

I just compiles this code on gcc and it works absolutly fine without
any errors, just few warning messeges. which compiler are you using?

[noblesantosh@yahoo.com]

Re: Correct Typedef

Priya, I don't know which compiler you are using to compile this code,
here I'm using gcc and it is not giving any errors only one warning
that is

17: warning: passing arg 1 of `func' from incompatible pointer type

The problem is in function call " error = func(&str, "abc.txt"); "
correct it to " error = func(str, "abc.txt"); " removing &.
Now it is working fine.

Santosh.

[Yohji]

Re: Correct Typedef



Priya Mishra wrote:[color=blue]
> What is wrong in the below code,
> I get the 2 error when i compile the prog... what is mean ??
>
>
> error C2275: structure: illegal use of this type as an expression
> error C2065: str: undeclared identifier
>
>
> typedef struct
> {
> char file;
> int a;
> int b;
> int c;
>
>
>
> } structure;
>
>
> int func(structure *Ob,
> char *fileName);
>
> int main(int argc, char **argv )
> {
>
>
> int error;
> structure *str;
>
>
> error = func(&str, "abc.txt");
>
>
> return error;
> }
>
> Thanks
> Priya[/color]

Er,wrong here:

error = func(&str, "abc.txt");

'str' is of structure * type,so '&str' is structure ** .But the
prototype of func is:

int func(structure *,
char *);

[Lawrence Kirby]

Re: Correct Typedef

On Wed, 13 Jul 2005 03:51:33 -0700, noblesantosh wrote:
[color=blue]
> I just compiles this code on gcc and it works absolutly fine without
> any errors, just few warning messeges. which compiler are you using?[/color]

Warning messages are diagnostics just as much as error messages. The
comnpiler warned you that there is something wrong with the code, whether
it decides to continue compiling or not isn't particularly significant.

Lawrence

[Lawrence Kirby]

Re: Correct Typedef

On Wed, 13 Jul 2005 01:44:11 -0700, Suman wrote:
[color=blue]
> Priya Mishra wrote:[color=green]
>> What is wrong in the below code,
>> I get the 2 error when i compile the prog... what is mean ??
>>
>>
>> error C2275: structure: illegal use of this type as an expression
>> error C2065: str: undeclared identifier[/color]
> Does that mean you are using VC++? Use a C compiler, will you, please?[/color]

VC++ is a C compiler if invoked correctly.
[color=blue]
> #include <stdio.h>[/color]

You might as well drop this because nothing in the code needs it.

Lawrence

[David Resnick]

Re: Correct Typedef



Priya Mishra wrote:[color=blue]
> What is wrong in the below code,
> I get the 2 error when i compile the prog... what is mean ??
>
>
> error C2275: structure: illegal use of this type as an expression
> error C2065: str: undeclared identifier
>
>
> typedef struct
> {
> char file;
> int a;
> int b;
> int c;
>
>
>
> } structure;
>
>
> int func(structure *Ob,
> char *fileName);
>
> int main(int argc, char **argv )
> {
>
>
> int error;
> structure *str;
>
>
> error = func(&str, "abc.txt");
>
>
> return error;
> }
>
> Thanks
> Priya[/color]

I'm wondering if your compiler uses structure as a keyword
or something odd. The only problem I see is that you have
a prototype for func taking a structure* and you are passing
it a structure**. Compiles fine for me (gcc) once that is
repaired and func is defined.

-David