Thread: file question..

Originally Posted by transgalactic2

how the F am i supposed to do it without breaking the file into a structure??

Just use a string and your functions extract the relevant details with fscanf. You could use delimiters other than spaces if that makes it easier (eg. "dany:smith:15:gbgnh").

Originally Posted by transgalactic2

i cant see what you are saying

I just noticed "no arrays" -- does that mean no char arrays, or no arrays of strings?

If you can't use a char array, wow is that tedious. You will have to use fgetc() or fread() byte by byte and have a function that for every line in one file (use the \n) goes through all of the other file (byte by byte) looking for a match. Very silly stuff.

I would verify that you can't use a string for storage first, your prof has really outdone himself, ridiculousness wise, if that is the case.

i get a solution to a similar proglem
and they use this weird lines all the way
what they mean??

Code:

fscanf(fold,"%29[^$]%10s%38[^$]%*c",details1old,teold,details2old);

Let me google that for you

Sure, but this is still using strings. If you cannot use a char array, there is no point in using a scanf function. You will have to use fgetc and work with the int value of each character.

If you can use a char array, then do use fgets and fscanf.

Originally Posted by transgalactic2

but i cant figure our this fscanf line

how many links from 172000 brought by google you have already studied?

Originally Posted by transgalactic2

Code:

fscanf(fold,"%29[^$]%10s%38[^$]%*c",details1old,teold,details2old);

Read up to 29 chars into variable details1old unless a '$' is found earlier, then read up to 10 chars into teold unless a whitespace is found earlier, then read up to 38 chars into details2old unless '$' is found earlier, and skip the rest
I think you should google scanf format specifiers.
Kurt

Wow, nice job by Zuk. But transgalactic2, don't get distracted. Based on your OP, if you can use strings, you don't need anything more complicated that this:

Code:

FILE *in;
char buffer[64];
while ((fgets(buffer,63,in)) {
       fscanf(buffer, "%s %s %d %s", fname, lname, age, comment);
}

And in fact 15+15+30+3=63, so your prof must have been thinking of this nice even block size.

why do you pass 63 to fgets?

should be sizeof buffer if it is so hard to calculate buffer length

and second call should be sscanf of course

also age probably misses &

Originally Posted by transgalactic2

what the while condition means??

what fgets returns?

when you start using google?

do you want to learn something?

do you love to irritate people?

why are you trolling so much?

why don't you choose another forum for meaningless postings?

You're a character, vart. Nuff said.

fgets will return a null pointer at EOF. That's what I'm testing for. Maybe you noticed this is the "C programming forum"?

[edit] Oh no! I just noticed this was in response to trans2's post to my post. I am very sorry vart, hope there's no hard feelings...I guess this makes me all three of impatient, ignorant, and PARANOID.

Sorry sorry sorry.

@trans2 -- read the documentation, fer chrissake
[edit] yes, it should be sscanf, whoops. I used 63 because fgets adds a null terminator. and &with the %d. sorry sorry sorry