how to get appointed colums?

This is a discussion on how to get appointed colums? within the C Programming forums, part of the General Programming Boards category; file1 Code: 1275 14.88 0.51 0.51 Contig_000000006 202 397 (38) rnd-1_family-87#LTR/Gypsy 1019 1214 (214) 5 269 18.42 5.13 2.56 Contig_000000006 ...

  1. #1
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    how to get appointed colums?

    file1
    Code:
    1275 14.88 0.51 0.51 Contig_000000006 202 397 (38) rnd-1_family-87#LTR/Gypsy 1019 1214 (214) 5
    269 18.42 5.13 2.56 Contig_000000006 338 415 (20) C rnd-1_family-1089#Unknown (3) 200 121 5
    I want to get the fifth column the sixth column(separated by blank), how can I do ?
    result as follows

    Code:
    Contig_000000006 202
    Contig_000000006 338

  2. #2
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    Exactly how you could do it, depends on how you're dealing with these data items, now.

    You might read in the current data, and then write it back out, in the order you want it to be in.

  3. #3
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    Code:
    awk '{ print $5 $6 }' file.txt
    Just like you would do it in C, except that
    - opening files
    - reading lines
    - splitting into fields
    is all part of AWK, and something you have to do yourself in C.
    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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    Quote Originally Posted by Adak View Post
    Exactly how you could do it, depends on how you're dealing with these data items, now.

    You might read in the current data, and then write it back out, in the order you want it to be in.
    can I use fscanf function?
    is it efficiency?

  5. #5
    and the hat of wrongness Salem's Avatar
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    Yes,
    and No.
    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.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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    Without code, it's not practical to give detailed advice. Post your code, and then we can talk "turkey".

    C is efficient, and so is scanf(). The only thing C is less than efficient with, is in certain string handling routines. If you have very long strings, use blocks of memory, and pointers - but it's not as easy as doing it with a language that supports a native string data type.

  7. #7
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    Quote Originally Posted by Adak View Post
    Without code, it's not practical to give detailed advice. Post your code, and then we can talk "turkey".

    C is efficient, and so is scanf(). The only thing C is less than efficient with, is in certain string handling routines. If you have very long strings, use blocks of memory, and pointers - but it's not as easy as doing it with a language that supports a native string data type.
    Code:
    fscanf(fp,"%d %f %f %f %s %d %d %s %s %s %d %d %d %d",&b,&a,&a,&a,r_name,&r_start,&r_end,c,r_fam,c,&b,&b,&b,&b);

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