For Dev-C++, you have to include one file in another.
So either add *#include "file1.c" *in file2.c and compile file2.c or
add *#include
"file2.c" *in file1.c and compile file1.c.
Hope this helps.
*Neeraj Gangwar*
B.Tech. IV Year
Electronics and Communication IDD
Indian Institute of Technology Roorkee
Contact No. : +91 9897073730
On Fri, Nov 16, 2012 at 9:11 AM, Rahul Kumar Dubey <rkd7...@gmail.com>wrote:
> @rahulsharma
> file1.c
>
> #include<stdio.h>
> extern int i;// defintion provided in this file itself
> extern int j; // definition provided in file2
> void next()
> {
> ++i;
> other();
> }
> int main()
> {
> ++i;
> printf("%d\n",j);
> printf("%d\n",i);
> next();
> }
> int i=3;
>
> // end of file1.c
>
> file2.c
> extern int i; // declaration of i as extern
> int j=10; // j defined in file2 here which was declared as extern in file 1
>
> void other()
> {
> ++i;
> printf("%d\n",i);
> }
> // end of file2.c
>
> compile both file together
> as
> rahul@rahul:~gcc file1.c file2.c
> rahul@rahul:~./a.out
> you will get the required output
>
>
>
>
>
> On Fri, Nov 16, 2012 at 8:27 AM, Neeraj Gangwar <y.neeraj2...@gmail.com>wrote:
>
>> That's why you are getting the error. You have to compile both the files
>> together. Search on google. I don't use dev c++.
>>
>> *Neeraj Gangwar*
>> B.Tech. IV Year
>> Electronics and Communication IDD
>> Indian Institute of Technology Roorkee
>> Contact No. : +91 9897073730
>>
>>
>> On Thu, Nov 15, 2012 at 11:32 PM, rahul sharma
>> <rahul23111...@gmail.com>wrote:
>>
>>> No...individually...dev cpp..how to compile both together???
>>>
>>>
>>> On Thu, Nov 15, 2012 at 9:26 PM, Neeraj Gangwar
>>> <y.neeraj2...@gmail.com>wrote:
>>>
>>>> Which compiler are you using ? Are you compiling both the files
>>>> together ?
>>>>
>>>> *Neeraj Gangwar*
>>>> B.Tech. IV Year
>>>> Electronics and Communication IDD
>>>> Indian Institute of Technology Roorkee
>>>> Contact No. : +91 9897073730
>>>>
>>>>
>>>>
>>>> On Thu, Nov 15, 2012 at 9:10 PM, rahul sharma
>>>> <rahul23111...@gmail.com>wrote:
>>>>
>>>>> but how can i use extern..if i simply declare a variable in file1 as
>>>>> int j and try to use in file2 with extern then it shows that j nit
>>>>> defined..how cum file2 knows in which file j is defined....for e.g if i
>>>>> use
>>>>> extern in file it means that this variable/fxn is defined somewhr
>>>>> else.then
>>>>> what are those files in which it searches this variable definition..i m
>>>>> getting error....plese give me 2 files in which one files defines variable
>>>>> and other uses using extern.....its not working for me....
>>>>>
>>>>> On Thu, Nov 15, 2012 at 12:08 PM, Rahul Kumar Dubey <rkd7...@gmail.com
>>>>> > wrote:
>>>>>
>>>>>> @rahul it will compile perfectly well . note that you have declared j
>>>>>> in file 1 as extern and used it and have not provided its definition any
>>>>>> where
>>>>>> so getting compile error.
>>>>>> as far as functions are concerned they are external by defaullt as
>>>>>> specified by @shobhit
>>>>>>
>>>>>> i am attaching your corrected code which runs fine ...
>>>>>> file1.c
>>>>>>
>>>>>>
>>>>>> #include<stdio.h>
>>>>>> extern int i;
>>>>>> //extern int j; // provide a declaration for this
>>>>>> void next(void);
>>>>>>
>>>>>> int main()
>>>>>> {
>>>>>> ++i;
>>>>>> printf("%d\n",i);
>>>>>>
>>>>>> next();
>>>>>> getchar();
>>>>>> }
>>>>>> int i=3;
>>>>>> void next()
>>>>>> {
>>>>>> ++i;
>>>>>> printf("%d\n",i);
>>>>>> //printf("%d",j); // since no defintion provided so getting error
>>>>>> other();
>>>>>> }
>>>>>>
>>>>>> file2.c
>>>>>>
>>>>>>
>>>>>> extern int i;
>>>>>> void other()
>>>>>> {
>>>>>> ++i;
>>>>>> printf("%d\n",i);
>>>>>> }
>>>>>>
>>>>>> if you want to use j u need to provide defintion either in file 1 or
>>>>>> file 2
>>>>>> output:
>>>>>> 4
>>>>>> 5
>>>>>> 6
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Wed, Oct 24, 2012 at 10:56 PM, rahul sharma <
>>>>>> rahul23111...@gmail.com> wrote:
>>>>>>
>>>>>>> can nyone provide me dummy code of how exactly to use extern in c..
>>>>>>> in dev environment
>>>>>>>
>>>>>>> when i declare int i in one fyl
>>>>>>> and try use use with extern int i in another then it doesnt
>>>>>>> compile..plz coment
>>>>>>>
>>>>>>>
>>>>>>> On Wed, Oct 24, 2012 at 9:58 PM, rahul sharma <
>>>>>>> rahul23111...@gmail.com> wrote:
>>>>>>>
>>>>>>>> Then why its not running?
>>>>>>>>
>>>>>>>>
>>>>>>>> On Wed, Oct 24, 2012 at 6:50 PM, SHOBHIT GUPTA <
>>>>>>>> shobhitgupta1...@gmail.com> wrote:
>>>>>>>>
>>>>>>>>> http://www.geeksforgeeks.org/archives/840
>>>>>>>>>
>>>>>>>>> By default, the declaration and definition of a C function have
>>>>>>>>> “extern” prepended with them. It means even though we don’t use
>>>>>>>>> extern with
>>>>>>>>> the declaration/definition of C functions, it is present there. For
>>>>>>>>> example, when we write.
>>>>>>>>>
>>>>>>>>> int foo(int arg1, char arg2);
>>>>>>>>>
>>>>>>>>> There’s an extern present in the beginning which is hidden and the
>>>>>>>>> compiler treats it as below.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> extern int foo(int arg1, char arg2);
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Wed, Oct 24, 2012 at 4:40 PM, rahul sharma <
>>>>>>>>> rahul23111...@gmail.com> wrote:
>>>>>>>>>
>>>>>>>>>> Pleaase reply with sol as asp
>>>>>>>>>>
>>>>>>>>>> Fille 1:
>>>>>>>>>> #include<stdio.h>
>>>>>>>>>> extern int i;
>>>>>>>>>>
>>>>>>>>>> extern int j;
>>>>>>>>>> void next(void);
>>>>>>>>>> int main()
>>>>>>>>>> {
>>>>>>>>>> ++i;
>>>>>>>>>> printf("%d",i);
>>>>>>>>>> next();
>>>>>>>>>> getchar();
>>>>>>>>>> }
>>>>>>>>>> int i=3;
>>>>>>>>>> void next()
>>>>>>>>>> {
>>>>>>>>>> ++i;
>>>>>>>>>> printf("%d",i);
>>>>>>>>>> printf("%d",j);
>>>>>>>>>> other();
>>>>>>>>>> }
>>>>>>>>>> File 2:
>>>>>>>>>> extern int i;
>>>>>>>>>>
>>>>>>>>>> void other()
>>>>>>>>>> {
>>>>>>>>>> ++i;
>>>>>>>>>> printf("%d",i)'
>>>>>>>>>> }
>>>>>>>>>>
>>>>>>>>>> How cum file 1 knows what is other();as we havnet define with
>>>>>>>>>> extern void other();
>>>>>>>>>> it should be error????
>>>>>>>>>> but when i include the statemetn extern void other,then also it
>>>>>>>>>> shows??
>>>>>>>>>> pls provide me o/p of this questiona nd also tell how use use
>>>>>>>>>> variable of one file in other as simply writing extern in a is not
>>>>>>>>>> accesing
>>>>>>>>>> global a of other file....
>>>>>>>>>>
>>>>>>>>>> --
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>>>>>>
>>>>>>
>>>>>> --
>>>>>> *RAHUL KUMAR DUBEY*
>>>>>> *BTech-3rd year *
>>>>>> *Computer Science &Engineering *
>>>>>> *Motilal Nehru National Institute Of Technology*
>>>>>> *Allahabad[211004],UP.*
>>>>>>
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>
>
>
> --
> *RAHUL KUMAR DUBEY*
> *BTech-3rd year *
> *Computer Science &Engineering *
> *Motilal Nehru National Institute Of Technology*
> *Allahabad[211004],UP.*
>
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