formating data from a file

This is a discussion on formating data from a file within the C Programming forums, part of the General Programming Boards category; Hi I want to know what the easiest way of reading information from a file is, all the files are ...

  1. #1
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    Mar 2006
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    formating data from a file

    Hi I want to know what the easiest way of reading information from a file is, all the files are formated as

    line of text
    [# lines of ints] [# of ints per line]
    int int int int
    int int int int
    etc.

    Here is an example file:

    HS_problem_1 problem_10_10
    10 10
    0 0 0 0 1 0 0 1 0 0
    0 0 1 0 0 1 0 0 0 1
    1 0 0 1 0 0 0 0 0 1
    1 0 1 0 1 0 1 1 0 0
    0 0 0 0 0 0 0 1 1 0
    0 0 0 0 1 0 1 0 1 0
    0 0 0 0 0 0 1 0 0 0
    0 1 0 0 0 0 0 1 0 0
    0 0 0 1 0 0 1 0 0 0
    0 1 0 0 0 0 0 0 1 0

    How would i go about it?
    thanks

  2. #2
    Just Lurking Dave_Sinkula's Avatar
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    5,006
    >How would i go about it?

    Something along this line.

    line of text <read whole line using fgets>
    [# lines of ints] [# of ints per line] <read whole line using fgets, parse rows and cols with sscanf>
    <malloc rows in 2D array>
    <for loop through rows>
    <nested for loop through cols>
    <malloc cols in 2D array>
    int int int int<read data using fscanf>
    int int int int...>
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

  3. #3
    Been here, done that.
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    1,161
    Just in case you are a newbie, and assuming you know the maximum row/column size in any of the files you're bound to read, create a 2D array that will hold the largest data and forget the malloc() part of Dave's suggestion. The rest is fine.
    Definition: Politics -- Latin, from
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    tics meaning blood sucking parasites
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  4. #4
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    thanks for the help

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