file dummy

This is a discussion on file dummy within the C Programming forums, part of the General Programming Boards category; When reading from a file and then sorting, are u supposed to enter a few dummy values? What i mean ...

  1. #1
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    file dummy

    When reading from a file and then sorting, are u supposed to enter a few dummy values?

    What i mean to say is, if i have to read a file into a linked list and then sort the file based on certain criteria, do i have to make dummy values to initialise the list?

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    Registered User Zeeshan's Avatar
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    Your question is not at all clear...

    Still, most probably the answer is no. Why would need any dummy values ? Where'd you get that idea ?
    Last edited by Zeeshan; 06-04-2002 at 11:01 PM.

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    I've seen a sample program where a file has to bve read into a linked list and the programmer used dummy values and i just wanted to know if they were necessary or not. I guess that its not a big thing but if anyone does know anything reply

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    I just tried the code without a dummy value and i got a segmenatio fault. I guess that u do need to have dummy values of some sort.

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    What are these dummy values and where are you using them???

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    these dummy values go something like this...


    Lets say i want to read in a file with this format

    "number name rate"

    then a procedure just initialises this list by adding dummy values like:

    "-1" "" "0.0"

    This is done before the file is actually read in to the linked list. I beleive that it is done to initialise the linked list

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    Sometimes a dummy node is put in front of a list. This is to prevent from having an empty list and it can be useful having a fixed root. For example when sorting the list and the first node must be replaced. When having a fixed root, it is the second note and you can keep the root-pointer to just the first node.

    >When reading from a file and then sorting, are u supposed to
    >enter a few dummy values?

    No, that is not necessary.

    >I just tried the code without a dummy value and i got a
    >segmenatio fault. I guess that u do need to have dummy values
    >of some sort.

    I think it is implementation dependent. If the program expects dummy initialisation values, then it might crash or exit if it doesn't find it. Take a look at how the list is initialised and how initialisation is related to the file. I think that will provide the answer.

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