I've been reading up on fopen and fclose and all, and I was wondering if there was a way to open a text file and modify a character a certain amount of places into the file...for example, open a text file and change the 5th character inside the file (irregardless of what that character is) to some other character that I decide on.
Thanks,
Ash
a simple way is
Code:FILE *fp; size_t i; char ch = 'a'; /* any char you like */ fp = fopen("filename", "r+"); /* test fp here */ for ( i = 1; i != 5; ++i ) { getc(fp); } fputc(ch, fp);
Last edited by Antigloss; 01-26-2006 at 10:53 AM. Reason: miss the `+' before
Too simple? Wrong mode and you'd still need the fseek, so you might as well skip the loop.Originally Posted by Antigloss
http://c-faq.com/stdio/fupdate.html
7. It is easier to write an incorrect program than understand a correct one.
40. There are two ways to write error-free programs; only the third one works.*
To use fseek effectively, the file should be opened in binary mode
I just got off work, and am just online real quick while I can be, I'm gonna save this page and view it later and try what you guys said (after I get some sleep - I work graveyard - thanks a lot for the help
If you open a file in mode "*+", don't forget to call fflush() between reading and writing the same file.
dwk
Seek and ye shall find. quaere et invenies.
"Simplicity does not precede complexity, but follows it." -- Alan Perlis
"Testing can only prove the presence of bugs, not their absence." -- Edsger Dijkstra
"The only real mistake is the one from which we learn nothing." -- John Powell
Other boards: DaniWeb, TPS
Unofficial Wiki FAQ: cpwiki.sf.net
My website: http://dwks.theprogrammingsite.com/
Projects: codeform, xuni, atlantis, nort, etc.
