sequential vs random

This is a discussion on sequential vs random within the C Programming forums, part of the General Programming Boards category; What is the difference between sequential access file and random access file...

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    sequential vs random

    What is the difference between sequential access file and random access file

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    Are these a bunch of homework questions? STFW.
    If you understand what you're doing, you're not learning anything.

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    No I am trying to understand the difference between access a file sequentially and randomly. How is it done in C? For example if I have 1000 files numbered 1 to 1000 and I want to access file number 57. If I do it sequentially I have to access the first 56. But I want to directly go to file number 57. How can it be done in C.

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    Quote Originally Posted by rajabadsha
    No I am trying to understand the difference between access a file sequentially and randomly. How is it done in C? For example if I have 1000 files numbered 1 to 1000 and I want to access file number 57. If I do it sequentially I have to access the first 56. But I want to directly go to file number 57. How can it be done in C.
    Assuming the record size is fixed, you'd use some simple mathematics and a call to fseek to jump forward/backwards a certain number of bytes from the beginning/end of the file. For example, assuming 100 byte records, if you wanted to access the 57th record, you'd do an fseek to the 5600 ((57-1) *100) byte and start reading from that point.
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