How to Extract data from text file, modify data in a text file and save it

This is a discussion on How to Extract data from text file, modify data in a text file and save it within the C Programming forums, part of the General Programming Boards category; Hi, I have got two problems with file operations. (1) how to read data from a text file into a ...

  1. #1
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    Cool How to Extract data from text file, modify data in a text file and save it

    Hi,

    I have got two problems with file operations.

    (1) how to read data from a text file into a matrix from second line

    txt file like this:

    a b c d
    1 2 3 3
    5 6 6 7

    I want to get x= [ 1 2 3 3; 5 6 6 7] for calculation from the text file.

    (2) How to modify some real numbers in a text file and save it for another use.

    txt file like this:

    a
    b
    1.1
    2.1
    4.6
    6.8

    I want to modify these real numbers: 1.1 2.1 4.6 6.8 to other real numbers, say 2.1 3.0 8.0 9.2, and save these changes in this text file for running other program.

    Thanks for your help!
    Shark
    Last edited by sharkman; 05-25-2011 at 06:36 PM.

  2. #2
    ATH0 quzah's Avatar
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    It must be really hard being a completely blind programmer. Because if you weren't blind, you would have seen this link right at the top of the list when you posted: Extracting Information from Files


    Quzah.
    Hope is the first step on the road to disappointment.

  3. #3
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    Quote Originally Posted by quzah View Post
    It must be really hard being a completely blind programmer. Because if you weren't blind, you would have seen this link right at the top of the list when you posted: Extracting Information from Files


    Quzah.
    I saw the post but I expect to have a clear answer (original C program or simple solutions) about the problems from others.
    Thanks!

  4. #4
    ATH0 quzah's Avatar
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    You expect us to do it for you? Good luck with that.


    Quzah.
    Hope is the first step on the road to disappointment.

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