How to integrate two c files

[neha_chhatre@yahoo.co.in]

hello
i have a problem... have written two separate c files named read.c
and twinkle.c

the file read.c, after running stores some values in an array name
average[] and it has a count variable k......

now i need to read both average[] and the variable k from the
twinkle.c file

How do i integrate the two files r in short..how do i read the values
of average[] and count variable k from twinkle.c

Please help me urgently....... .......

[Michael Mair]

Re: How to integrate two c files

neha_chhatre@ya hoo.co.in wrote:

hello
i have a problem... have written two separate c files named read.c
and twinkle.c
>
the file read.c, after running stores some values in an array name
average[] and it has a count variable k......
>
now i need to read both average[] and the variable k from the
twinkle.c file
>
How do i integrate the two files r in short..how do i read the values
of average[] and count variable k from twinkle.c
>
Please help me urgently....... .......

-- program.c --
#include "read.h"
#include "twinkle.h"

int main(void)
{
int k = 0;
int* array = 0;
MyRead(&array, &k);
if (NULL == array)
{
MyTwinkle(array , k);
}
MyReadCleanup(& array, k);
return 0;
}
----
-- read.h --
void MyRead (int **pArray, int *pK);
void MyReadCleanup (int **pArray, int k);
----
-- twinkle.h --
void MyTwinkle (int *array, int k);
----

Fill in twinkle.c, read.c as necessary.

Cheers
Michael
--
E-Mail: Mine is an /at/ gmx /dot/ de address.

[Mark Bluemel]

Re: How to integrate two c files

neha_chhatre@ya hoo.co.in wrote:

hello
i have a problem... have written two separate c files named read.c
and twinkle.c
>
the file read.c, after running stores some values in an array name
average[] and it has a count variable k......
>
now i need to read both average[] and the variable k from the
twinkle.c file
>
How do i integrate the two files r in short..how do i read the values
of average[] and count variable k from twinkle.c
>
Please help me urgently....... .......

Are you (yet) another of those people trying to teach themselves C
without reading a decent book or tutorial?

[MisterE]

Re: How to integrate two c files


<neha_chhatre@y ahoo.co.inwrote in message
news:5d674a5b-4b8e-4939-8135-9d116bf44cab@f4 7g2000hsd.googl egroups.com...

hello
i have a problem... have written two separate c files named read.c
and twinkle.c
>
the file read.c, after running stores some values in an array name
average[] and it has a count variable k......
>
now i need to read both average[] and the variable k from the
twinkle.c file
>
How do i integrate the two files r in short..how do i read the values
of average[] and count variable k from twinkle.c
>
Please help me urgently....... ......

The easiest and most nasty way is to declare the variables as global
variables. So you would have somesomething like:
char avarage[100];
int index=0;
in read.c,
then in twinkle.c you can use them by defining:
extern char average[100];
extern int index;

the extern means they are externally declared in another file.

[santosh]

Re: How to integrate two c files

Mark Bluemel wrote:

neha_chhatre@ya hoo.co.in wrote:

>hello
>i have a problem... have written two separate c files named read.c
>and twinkle.c
>>
>the file read.c, after running stores some values in an array name
>average[] and it has a count variable k......
>>
>now i need to read both average[] and the variable k from the
>twinkle.c file
>>
>How do i integrate the two files r in short..how do i read the values
>of average[] and count variable k from twinkle.c
>>
>Please help me urgently....... .......

>
Are you (yet) another of those people trying to teach themselves C
without reading a decent book or tutorial?

To be fair K&R2, Harbison & Steele, K.N. King's C Programming: A Modern
Approach are typically not stocked in bookshops here. And if they are,
they are usually far beyond the budget of most people. Their best
choice is to shop for a used version on Amazon and similar sites. Local
authors are cheap enough, but unfortunately, both in cost and quality.

[David T. Ashley]

Re: How to integrate two c files

<neha_chhatre@y ahoo.co.inwrote in message
news:5d674a5b-4b8e-4939-8135-9d116bf44cab@f4 7g2000hsd.googl egroups.com...

i have a problem... have written two separate c files named read.c
and twinkle.c
>
the file read.c, after running stores some values in an array name
average[] and it has a count variable k......
>
now i need to read both average[] and the variable k from the
twinkle.c file
>
How do i integrate the two files r in short..how do i read the values
of average[] and count variable k from twinkle.c

Generally speaking, .H files allow you to declare an interface to the
corresponding .C file, which may include global variables.

When you start using .H files, there are a few things you want to provide
for:

a)A given include file should "stand alone", i.e. not require the inclusion
of any other files. (The generally requires that it itself include files,
and requires some mechanism that deals with multiple inclusion).

b)You want to avoid identifying the characteristics of anything in more than
one place (change and consistency risk).

c)You want full prototype linkage--you want the definition of a function
checked against the prototype, and the prototype checked against the
invocations.

Here are some sample files that may be a suitable example:

http://esrg.cvs.sourceforge.net/esrg/esrgpcpj/shared/c_datd/esrg_md5.h?revision=1.8&view=markup

http://esrg.cvs.sourceforge.net/esrg/esrgpcpj/shared/c_datd/esrg_md5.c?revision=1.10&view=markup

Unfortunately the examples above don't have any global data, but it can be
placed in the .H file using the DECMOD_ ... construct.

For example:

DECMOD_MYMODULE int bart_simpsons_i q_readings[5]
#ifdef MODULE_MYMODULE
= {32, 49, 57, 23, 33}
#endif
;

Note that this expands a bit differently when compiling the owning module
rather than others.

Dave.

[Flash Gordon]

Re: How to integrate two c files

David T. Ashley wrote, On 21/02/08 17:45:

<neha_chhatre@y ahoo.co.inwrote in message
news:5d674a5b-4b8e-4939-8135-9d116bf44cab@f4 7g2000hsd.googl egroups.com...

>i have a problem... have written two separate c files named read.c
>and twinkle.c
>>
>the file read.c, after running stores some values in an array name
>average[] and it has a count variable k......
>>
>now i need to read both average[] and the variable k from the
>twinkle.c file
>>
>How do i integrate the two files r in short..how do i read the values
>of average[] and count variable k from twinkle.c

>
Generally speaking, .H files allow you to declare an interface to the
corresponding .C file, which may include global variables.

On some implementations the case of the extension affects how the
compiler treats it so, traditionally, that should be .h and .c if you
are programming in C. Note that on some of these implementations .C will
cause the code to be compiled as C++.

When you start using .H files, there are a few things you want to
provide for:
>
a)A given include file should "stand alone", i.e. not require the
inclusion of any other files. (The generally requires that it itself
include files, and requires some mechanism that deals with multiple
inclusion).
>
b)You want to avoid identifying the characteristics of anything in more
than one place (change and consistency risk).
>
c)You want full prototype linkage--you want the definition of a function
checked against the prototype, and the prototype checked against the
invocations.

To achieve all of c you need to include the header file in the source
file that provides the definitions. I.e. a.c should #include a.h

Here are some sample files that may be a suitable example:
>

http://esrg.cvs.sourceforge.net/esrg/esrgpcpj/shared/c_datd/esrg_md5.h?revision=1.8&view=markup

>
>

http://esrg.cvs.sourceforge.net/esrg/esrgpcpj/shared/c_datd/esrg_md5.c?revision=1.10&view=markup

>
>
Unfortunately the examples above don't have any global data, but it can
be placed in the .H file using the DECMOD_ ... construct.
>
For example:
>
DECMOD_MYMODULE int bart_simpsons_i q_readings[5]
#ifdef MODULE_MYMODULE
= {32, 49, 57, 23, 33}
#endif
;
>
Note that this expands a bit differently when compiling the owning
module rather than others.

Many people don't like that style and would prefer a simple declaration
in the header and definition in the .c, i.e.

a.h
extern int bart_simsons_iq _readings[5];

a.c
#include <a.h>
int bart_simsons_iq _readings[5] = {32,49,23,33};

The compiler is guaranteed to report any mismatch because of the
inclusion of a.h so there is no risk of a type mismatch being missed.
--
Flash Gordon