Thread: problems with structure

"Time" "DryTempC" "DewPointC" "RH" "Day" "Year" "Month" "Jday"

???

You are getting 0 back from sscanf. You could add this:

Code:

printf("->%s<-\n%d items read: %d %f %f %d\n",line,retv,Time,DewPointC,DryTempC,RH);

which will show you want that first unread line is

Originally Posted by pokhara

yes i have the title for each column. But How to skip it?Because i need to read the files according to the title.

Use the return value of sscanf(). You can use "continue" to skip to the next iteration of the loop:

Code:

if (!retv) continue;

!retv means the same thing as "ret == 0" or "retv == NULL.

Not like that! Look:

Code:

for(i = 0; i<=240; i++) {
			fgets(line,256,in);
			retv=sscanf(line,"%d %f %f %d",&Time,&DewPointC,&DryTempC,&RH);
                        if (!retv) continue;
			printf("%d items read: %d %f %f %d\n",retv,Time,DewPointC,DryTempC,RH);

Originally Posted by pokhara

yes i have the title for each column. But How to skip it?Because i need to read the files according to the title.

Well that's different than what you've been saying all along. But it can be done, assuming you have tokens somehow to determine what needs to be read. Oh, and a place to store it would be good.

Code:

fgets titleline
for each word in the title
    token  = lookup this word
    add token to input list

for each remaining line in the file
    for each token in the token list
        variables,line,word = read variable from file based on token

Now this gets simpler if you know you have a set number of title styles. For example:

int int float
word float float int

Then you get to do:

Code:

fgets title
title style = title lookup, title you just read

for each remaining line in the file
    switch title style
        read line ( line format )

Quzah.

Originally Posted by pokhara

i tried this but still it is giving the first line

Are you sure you have the continue line in the right place, *before* the printf() line? This was what you posted earlier:

Code:

0 items read: 0 0.000000 0.000000 4196133
4 items read: 0 0.600000 -5.000000 67
4 items read: 1 0.000000 -3.900000 75

So retv was 0 for the first line. If you insert "if (!retv) continue;" BEFORE the printf() line, you should now get:

Code:

4 items read: 0 0.600000 -5.000000 67
4 items read: 1 0.000000 -3.900000 75
...etc