--- Mickey Mathieson <[EMAIL PROTECTED]> wrote:
>
> --- pushkar raj <[EMAIL PROTECTED]> wrote:
>
> > Hi everybody,
> >
> > I have a text file which contains a sequence of
> > characters terminated by newline.
> > I need to extract a sequence of character from the
> > file until i encounter underscore character.
> > The moment I encounter underscore character, I
> need
> > to move to the next line.
> > This process is to be repeated till I reach the
> end
> > of file.
> >
> > The code that I have been trying is given
> below.....
> > The problem with this code is that the loop
> doesn't
> > terminate.
> >
> > #include<stdio.h>
> > #include<conio.h>
> > #include<stdlib.h>
> >
> > int main()
> > {
> > FILE *fp1, *fp2;
> > char ch;
> > clrscr();
> > fp1=fopen("11.txt","r"); //the text file from
> > which I have to extract the string.
> > if(fp1==NULL)
> > {
> > printf("\n File not found");
> > exit(0);
> > }
> > fp2=fopen("12.txt", "w"); // the file into which
> I
> > have to write the extracted string
> >
> > while(!feof(fp1))
> > {
> > ch=fgetc(fp1); //the loop which extracts the
> > character till _ is reached
> > if(ch!='_')
> > {
> > fputc(ch, fp2);
> > }
> > else if(ch!='\n') //the loop which runs till
> new
> > line is reached, this loop
> > doesn't terminate.
> > {
> > ch=fgetc(fp1);
> > }
> > }
> > printf("\n Successfully completed...");
> > fclose(fp1);
> > //fclose(fp2);
> > getch();
> > return 0;
> > }
> >
> >
> > Please suggest an improvement on this piece of
> code
> > or debug the logical error in the code.
> >
> > The sample of file is as shown......
> > pus||hkar_sjs
> > pu#|shkar2001_sjs
> >
> > I need only the sequence of character upto _..
> > Rest of the characters are not be copied into the
> > other file.
> >
> >
> >
> >
> > ---------------------------------
> > Win a BlackBerry device from O2 with Yahoo!. Enter
> > now.
> >
> > [Non-text portions of this message have been
> > removed]
> >
> >
>
> This would be MUCH simpler if done in c++, but here
> is
> a solution in c.
>
>
>
> int main()
> {
> FILE *fp1, *fp2;
> char ch;
> bool IgnoreRestOfLine = false;
> // clrscr();
> fp1=fopen("11.txt","r") ; //the text file from
> which
> I have to extract the string.
>
> if (fp1==NULL)
> {
> printf("\n File not found");
> exit(0);
> }
>
> fp2=fopen("12.txt", "w"); // the file into which I
> have to write the extracted string
>
> while (!feof(fp1))
> {
> ch=fgetc(fp1) ; //the loop which extracts the
> character till _ is reached
>
> if (ch == '\n')
> {
> IgnoreRestOfLine = false;
> fputc('\n', fp2); // Adds a new line to the
> output file
> continue;
> }
>
> if (ch!='_' && !IgnoreRestOfLine)
> fputc(ch, fp2);
> else
> IgnoreRestOfLine = true;
>
> }
>
> printf("\n Successfully completed... ");
>
> fclose(fp1);
> fclose(fp2) ;
>
> // system("PAUSE");
> return(0);
> }
>
>
one small tweak - probably best not to set the flag
every time - so the following logic could be added.
if (ch!='_' && !IgnoreRestOfLine)
fputc(ch, fp2);
else
if (ch == '_')
IgnoreRestOfLine = true;
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Mickey M.
Construction Partner Inc.
http://www.constructionpartner.com
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