Please Help in searching value in text file

This is a discussion on Please Help in searching value in text file within the C Programming forums, part of the General Programming Boards category; Hi all, I'm new here and have quite limited knowledge of C. I'm facing a problem in writing this script. ...

  1. #1
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    Feb 2009
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    Please Help in searching value in text file

    Hi all, I'm new here and have quite limited knowledge of C. I'm facing a problem in writing this script. Please give me some hints. Thanks a lot.


    I have a big log file with info like:
    A - 10
    B - 100

    A - 10
    B - 200
    ......

    I have to compare it with another file with info like
    AB - 10100


    I want to compare the to files to see whether the values match and output to another file saying:

    Item 1:
    A - Match
    B - Match
    Item 2:
    A - Match
    B - Mismatch



    How can I do it in C?
    I tried to search for the keywords, but how can I get the values? Is there anything like offset so that I can point to the value of keyword?

  2. #2
    Registered User
    Join Date
    Sep 2006
    Posts
    8,868
    Open both files for input
    Open one file for output

    Use two instances of a struct. Each struct will have members like:

    Code:
    struct record {   //define what's in each record
    
       char letr;
       int amount;
    }rec1, rec2;      //and create two instances of this type of struct
    Now read through each file, getting one record of data from file #1, and one record of data from file #2. Your logic can be like:

    Code:
    more1 = fscanf(file_ptr1, "%c, %d", rec1.letr, rec1.amount)
    more2 = same as above but for the other file
    
    while (more1 && more2)  {
    
       make your comparisons rec1.member to rec2.member
    
       write out your data for matches and mismatches, here
    
       and get more data for another loop
       more1 = fscanf( %c, %d, rec1.letr, rec1.amount)
       more2 = same as above but for the other file
       
    }
    when either file is empty, the remaining data in the non-empty file, will 
    all be "mismatched" data, so handle that here, until the file with data, is also empty
    with another while loop 
    
    while(more1)
       //run out all the rest of the data, as "mismatched" to your file
    
    while(more2)
       //same here, for file2 data.
    All this "struct" stuff can be done with just two variables for each file, a char type, and an integer type. Make it clear by their names, which data if from file 1, and which is from file 2. No A and B type variables, make it a1 and a2, and b1 and b2, at least.

    If you have 3 or more things for each file that you want to check and compare, then a struct is the only way that makes sense. With only two things, you could use variables, fine.

    That's how I'd do it.

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