help needed - filtering a data file (with strings?)

This is a discussion on help needed - filtering a data file (with strings?) within the C Programming forums, part of the General Programming Boards category; Hi I have a file as below 5.537681 3.993655 -5.651005 1.835011 6.016797 -5.632307 -2.336837 5.943220 -5.699044 Now I want to ...

  1. #1
    Galligan
    Guest

    help needed - filtering a data file (with strings?)

    Hi
    I have a file as below
    5.537681 3.993655 -5.651005
    1.835011 6.016797 -5.632307
    -2.336837 5.943220 -5.699044

    Now I want to filter it with respect to the end value ie the first one is -5.651005.

    I thought to read each line as a string then decide if the value satified the filter (eg < -5.6) and then write the string to a file, but I couldnt get this to work.

    => How do you use pointers to access part of a string (ie the -5.651005), pass it to a variable as a float??

    I know this is simple, but any advice is gratefully received..... thx EG

  2. #2
    TransparentMember correlcj's Avatar
    Join Date
    Jun 2002
    Posts
    378

    Re: help needed - filtering a data file (with strings?)

    Originally posted by Galligan
    Hi
    I have a file as below
    5.537681 3.993655 -5.651005
    1.835011 6.016797 -5.632307
    -2.336837 5.943220 -5.699044

    Now I want to filter it with respect to the end value ie the first one is -5.651005.

    I thought to read each line as a string then decide if the value satified the filter (eg < -5.6) and then write the string to a file, but I couldnt get this to work.

    => How do you use pointers to access part of a string (ie the -5.651005), pass it to a variable as a float??

    I know this is simple, but any advice is gratefully received..... thx EG
    Try using s sort(). here

    Last edited by correlcj; 11-18-2002 at 09:24 AM.
    "Be formless, shapeless, like water... You put water into a cup, it becomes the cup, you put water into a bottle, it becomes the bottle, you put it in a teapot, it becomes the teapot... Now water can flow, or it can crash, be water my friend."
    -Bruce Lee

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