@Divya
For (3) : You are getting last line twice because of wrong usage of
feof(fp). Remember , feof() returns true after EOF file is reached and
not when EOF is read.
feof tells you end of file is reached and it can tell that only after
reading EOF and not while reading it !!
So after last line is printed , feof(fp) is still false, and then
program tries to read from file where it fails ( but no one checks
there if fgets(...) fails ) and program prints the old value (i.e.
last line ) . You can cross check this by making str null after every
print and you would see its not last line but the last value stored by
'str' which is printed. You should ideally do !feof(fp) after fgets()
OR use fgets() to check file end by " feof(....) != NULL OR similar
way.
Hope it helps.
On Jun 13, 8:57 pm, jalaj jaiswal <jalaj.jaiswa...@gmail.com> wrote:
> declaration of fclose in stdio.h is as fclose (FILE*);
> so it has too many arguments...
> On Sun, Jun 13, 2010 at 9:06 PM, divya jain <sweetdivya....@gmail.com>wrote:
>
>
>
> > sorry i pasted wrong questn unser 2..
>
> > the real question is
>
> > which file will get closed through fclose()
> > #include<stdio.h>
> > int main()
> > {
> > FILE *fp,*fs,*ft;
> > fp=fopen("a.c","r");
> > fs=fopen("b.c","r");
> > ft=fopen("c.c","r");
> > fclose(fp,fs,ft);
> > return 0;
> > }
>
> > 3. yes it is feof..srry typed it wrong... nd fgets(str,80,fp) is perfectly
> > fine.. now the ans to this questn is that last line of the file will be
> > printed twice...( which i m unable to get why)...plzz explain...
>
> > @ souravsain plzz ignore this mail..srry for the inconvenience..
>
> > On 13 June 2010 17:37, jalaj jaiswal <jalaj.jaiswa...@gmail.com> wrote:
>
> >> in question 1... ch gets the value of EOF... so first kicit 44-a
> >> gokulpeth\0 nagpur will get printed and then the value of EOF..
>
> >> question number 2 .. seems to me as nrml ...i think myfile.c only gets
> >> closed
>
> >> in question number 3..it shld be fgets(str,79,fp)
>
> >> On Sun, Jun 13, 2010 at 2:49 PM, divya <sweetdivya....@gmail.com> wrote:
>
> >>> 1. wat ll be the o/p. plz explain y?
> >>> // abc.c contains "kicit 44-a gokulpeth\0 nagpur"
> >>> #include<stdio.h>
> >>> #include<stdlib.h>
> >>> int main()
> >>> {
> >>> unsigned char ch;
> >>> FILE *fp;
> >>> fp=fopen("abc.c","r");
> >>> if(fp==NULL)
> >>> {
> >>> printf("unable to open the file \n");
> >>> exit(1);
> >>> }
> >>> while((ch=getc(fp))!=EOF)
> >>> printf("%c",ch);
> >>> fclose(fp);
> >>> printf("\n",ch);
> >>> return 0;
> >>> }
>
> >>> 2.which file will get closed through fclose() in the following
> >>> program and why?
> >>> #include<stdio.h>
> >>> int main()
> >>> {FILE *fp;
> >>> char ch;
> >>> int i=1;
> >>> fp=fopen(myfile.c","r");
> >>> while((ch=getc(fp)!=EOF))
> >>> {
> >>> if(ch=='\n')
> >>> i++;
> >>> }
>
> >>> fclose(fp);
> >>> return 0;
> >>> }
>
> >>> 3.point out the error if any in following
>
> >>> #include<stdio.h>
> >>> int main()
> >>> {
> >>> FILE *fp;
> >>> char str[80];
> >>> fp=fopen("trial","r");
> >>> while(!eof(fp))
> >>> {
> >>> fgets(str,80,fp);
> >>> puts(str);
> >>> }
> >>> fclose(fp);
> >>> return 0;
> >>> }
>
> >>> --
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> >> --
> >> With Regards,
> >> Jalaj Jaiswal
> >> +919026283397
> >> B.TECH IT
> >> IIIT ALLAHABAD
>
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> > --
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> --
> With Regards,
> Jalaj Jaiswal
> +919026283397
> B.TECH IT
> IIIT ALLAHABAD
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