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read data file in C

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Join Date: Nov 2007

Posts: 5

Reputation: marzuki is an unknown quantity at this point

Solved Threads: 0

marzuki

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Newbie Poster

read data file in C

Nov 14th, 2007

Dear all;

I have problem in reading data file in C. I have data like this:

00:00:00 R- 0.0654 345 +19
00:01:00 R+ 1.5678 324 +19
00:02:00 2.3456 315 +19
00:03:00 R- 1.2352 324 +19
........................ next until 1440 lines

What i want is only the data in third column, but as we see in second column sometimes is empty. I try read the data as string first like :
fscanf (fdin1, "%s %s %s %s %s",data1, data2, data3, data4, data5);
but in third coulumn i have trouble, because data5 = 00:03:00 not +19.

could help me how to read the data in the better way?

Thank you very much
Marzuki

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Join Date: Dec 2005

Posts: 5,850

Reputation: Salem has a reputation beyond repute

Solved Threads: 749

Salem

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Void main'ers are DOOMed

Re: read data file in C

Nov 14th, 2007

Read each line using fgets(), as in

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char buff[BUFSIZ];
while ( fgets( buff, sizeof buff, fdin1 ) != NULL ) {
  if ( sscanf( buff, "%s %s %s %s %s",data1, data2, data3, data4, data5) == 5 ) {
    // could be a line like 
    // 00:00:00 R- 0.0654 345 +19
  } else {
    // might be a line like
    // 00:02:00 2.3456 315 +19
  }
}
char buff[BUFSIZ];
while ( fgets( buff, sizeof buff, fdin1 ) != NULL ) {
  if ( sscanf( buff, "%s %s %s %s %s",data1, data2, data3, data4, data5) == 5 ) {
    // could be a line like 
    // 00:00:00 R- 0.0654 345 +19
  } else {
    // might be a line like
    // 00:02:00 2.3456 315 +19
  }
}

The key point is to read a whole line using fgets(). What you do afterwards is up to you in terms of validation and conversion.