Thread: scanf

Originally Posted by quzah

Control your loop with a counter. Keep track of when you stop looping.

I'm trying to do this and I'm doing something wrong Could you give an example of such a loop counter with scanf?

Thanks

I've actually fixed that problem, but there another problem now... How can I get scanf to ignore 'headers' in input files?

ie. If I have a set of data in a text file like

Student No. Exam Score
1234 90
2344 85

etc

then how do I ignore the first line?

Thanks

Here's my code so far for the scanf bit

Code:

   scanned=1;
   for (i=0; (i<MAX_ROW_SIZE)&&(scanned==1); i++) {
      for (j=0; j<NUM_DATA_TYPES; j++) {
          scanned=scanf("%lld", &data[i][j]);
      }
      k=k+1;
   }

Cheers

You can use fgets to read a line of data. Read the line of data you don't care about into a variable you don't care about and ignore it.

Originally Posted by tabstop

You can use fgets to read a line of data. Read the line of data you don't care about into a variable you don't care about and ignore it.

Umm, I've never used that before. How would I implement it in this context?

Also, If I'm not allowed to use it then what other method could I employ?

Thanks

Originally Posted by MK27

Okay, so you are feeding the files into stdin, not opening them with fopen() or something.

If you know that is how the file is, you can do this before the loop:

Code:

char trash[256];
fgets(trash,256,stdin);

that will take care of the first line.

Thanks for that. I'm doing something like "./project < data.txt"

Also, could I ask what the '256' in that variable means?

Thanks again