Set Maximum Number of characters (Precision) for positive and Negative Values

This is a discussion on Set Maximum Number of characters (Precision) for positive and Negative Values within the C++ Programming forums, part of the General Programming Boards category; Hi, I want to be able to jump to a particular line in a CSV file. I have read that ...

  1. #1
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    Set Maximum Number of characters (Precision) for positive and Negative Values

    Hi,

    I want to be able to jump to a particular line in a CSV file. I have read that in order to do so, each line must have the same size.

    Therefore, in writing the data to the file I want to set the number of characters to a specified/set number.

    I have tried:
    Code:
    file.setf(ios_base::fixed, ios_base::floatfield);
    	  file.precision(10);
    However, my issue is with negative values. Will negative values take up space?

    many thanks

  2. #2
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    I want to be able to jump to a particular line in a CSV file. I have read that in order to do so, each line must have the same size.
    If you want true random access files I suggest you investigate binary files. Text files are not really suited for random access. If you want to be able to jump to and read from a certain line it is possible, if you keep track of the file position where each line starts. However if you want to try to replace text in the middle of a file, that is a problem. It is usually not recommended to try to replace text in the middle of a text file, because it is not possible to erase a section, or insert text into a section. Text files are best suited for sequential access and appending data to the end of the file.

    Jim

  3. #3
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    Thanks for the heads up jim. Will look in to this! cheers

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