No...individually...dev cpp..how to compile both together??? On Thu, Nov 15, 2012 at 9:26 PM, Neeraj Gangwar <[email protected]>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 <[email protected]>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 <[email protected]>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 >>> <[email protected]>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 >>>> <[email protected]>wrote: >>>> >>>>> Then why its not running? >>>>> >>>>> >>>>> On Wed, Oct 24, 2012 at 6:50 PM, SHOBHIT GUPTA < >>>>> [email protected]> 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 < >>>>>> [email protected]> 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.... >>>>>>> >>>>>>> -- >>>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "Algorithm Geeks" group. >>>>>>> To post to this group, send email to [email protected]. >>>>>>> To unsubscribe from this group, send email to >>>>>>> [email protected]. >>>>>>> For more options, visit this group at >>>>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>>>> >>>>>> >>>>>> -- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "Algorithm Geeks" group. >>>>>> To post to this group, send email to [email protected]. >>>>>> To unsubscribe from this group, send email to >>>>>> [email protected]. >>>>>> For more options, visit this group at >>>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>>> >>>>> >>>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Algorithm Geeks" group. >>>> To post to this group, send email to [email protected]. >>>> To unsubscribe from this group, send email to >>>> [email protected]. >>>> For more options, visit this group at >>>> http://groups.google.com/group/algogeeks?hl=en. >>>> >>> >>> >>> >>> -- >>> *RAHUL KUMAR DUBEY* >>> *BTech-3rd year * >>> *Computer Science &Engineering * >>> *Motilal Nehru National Institute Of Technology* >>> *Allahabad[211004],UP.* >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Algorithm Geeks" group. >>> To post to this group, send email to [email protected]. >>> To unsubscribe from this group, send email to >>> [email protected]. >>> For more options, visit this group at >>> http://groups.google.com/group/algogeeks?hl=en. >>> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Algorithm Geeks" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> For more options, visit this group at >> http://groups.google.com/group/algogeeks?hl=en. >> > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. 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