hi to over come with core dump

**vijay85** · 01-14-2009

Code:

#include<stdio.h>
main()
{
FILE *fp=NULL;
char ch;
fp=fopen("/u/n073313/vijay/File.txt","rb");
while(1)
{
ch=fgetc(fp);
if(ch==EOF)
break;
printf("%c",ch);
}
fclose(fp);
}

its giving o/p with core dump:
939,MUM,ord,396,2,3.0,4.0
100,bom,nru,1009,10,4.0,6.0
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ÿÿÿÿÿÿÿ

please help me in this.
thanks&regards
vijay

**Elysia** · 01-14-2009

1) Indent.
2) Main returns int.
3) Does fopen fail? If yes, then do not attempt to read from it.

**tabstop** · 01-14-2009

When you compiled, you should have gotten a warning about how ch==EOF can never be true (EOF doesn't fit into a char, must be an int), so you should probably deal with that.

**vijay85** · 01-14-2009

hi tabstop,
when i am compiling i am not getting any warnings.
the o/p i am getting is correct it is reading the file.
939,MUM,ord,396,2,3.0,4.0
100,bom,nru,1009,10,4.0,6.0

but i am getting core only.

**stevesmithx** · 01-14-2009

I don't think that is "core dump".
They are garbage values or something.

As tabstop suggested, change char to int type.
If you have followed that already,perhaps the file didn't end with EOF.
You may have to enter ctrl+D or ctrl+z at the end of the file depending on the OS.

**matsp** · 01-14-2009

Originally Posted by stevesmithx

I don't think that is "core dump".
They are garbage values or something.

As tabstop suggested, change char to int type.
If you have followed that already,perhaps the file didn't end with EOF.
You may have to enter ctrl+D or ctrl+z at the end of the file depending on the OS.

No modern OS actually cares about EOF characters. In old days (prior to DOS, such as CP/M, RSX/RSTS-E/RT11 - I'm sure other old OS's had this concept too) filesystems often kept the file-size in number of blocks, and of course, to know where the final block ended, you'd have to have something to indicate that "you have now read everything in this file", and CTRL-Z was often used for this purpose in those systems.

--
Mats

**vijay85** · 01-14-2009

Thanks alot
tabstop and all i changed from char to int its working.

**stevesmithx** · 01-14-2009

Originally Posted by matsp

No modern OS actually cares about EOF characters. In old days (prior to DOS, such as CP/M, RSX/RSTS-E/RT11 - I'm sure other old OS's had this concept too) filesystems often kept the file-size in number of blocks, and of course, to know where the final block ended, you'd have to have something to indicate that "you have now read everything in this file", and CTRL-Z was often used for this purpose in those systems.

--
Mats

Thanks for the nice info once again, Mats.

prior to DOS, such as CP/M, RSX/RSTS-E/RT11

Never heard of these OSes before.

**matsp** · 01-14-2009

Some references:
http://en.wikipedia.org/wiki/CP/M
http://en.wikipedia.org/wiki/RSX-11
http://en.wikipedia.org/wiki/RT-11
http://en.wikipedia.org/wiki/RSTS/E

I have used CP/M and RSTS/E (which has a subset of RT-11 and RSX-11 emulation as well, so code written for RT-11 or RSX-11 can be used in RSTS/E, as long as it's not doing too much "funny stuff").

--
Mats

**Salem** · 01-14-2009

Learn to recognise that EOF cast to a char very frequently ends up looking like ÿ

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