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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