Thread: how to read each line in text??

  1. #1
    Registered User
    Join Date
    Nov 2006

    how to read each line in text??


    I want to read a line in a file1.txt and check if the first letter contains 'a' or 's' , then print it in another file file2.txt.

    I am trying it by fread and fwrite.

    I did it for single line in file1.txt.
    ie., I define character string to 100 characters , as char c[100];

    I restrict to read a line of 20 characters only. ie. fread(c,1,20,file2);

    but, I cann't able to read the next line to check whether it stars with 'a' or 's'.

    what can i do to read each line in the file1.txt file.

    thank you.

  2. #2
    Fear the Reaper...
    Join Date
    Aug 2005
    Toronto, Ontario, Canada
    The thing with fread is that is reads 20 objets of 1 byte, so therefore you may or may not be reading a line every time (as it could read in the newline character and then it would continue on the next line). What you really want is fgets. That'll do the job for you.
    Teacher: "You connect with Internet Explorer, but what is your browser? You know, Yahoo, Webcrawler...?" It's great to see the educational system moving in the right direction

  3. #3
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    I prefer to use fgets() for reading text files, but it's your call.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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