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Sorting dates into ascending order

This is a discussion on Sorting dates into ascending order within the C Programming forums, part of the General Programming Boards category; Hi all I am trying to sort dates into ascending order I currently have a structure to represent dates Code: ...

  1. #1
    Registered User
    Join Date
    Feb 2012
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    4

    Sorting dates into ascending order

    Hi all

    I am trying to sort dates into ascending order

    I currently have a structure to represent dates

    Code:
    struct dates{
    
    char month[10];
    int day;
    int year;
    
    
    };
    I then have an array of type struc date, which stores each date input by the user.

    My question is. How do I sort the dates into ascending order when it is input in the following format:

    Jan(date.month) 10(date.day) 01(date.year)

    I am not looking for code but rather an explanation as to how this can be achieved.

    Thank you

  2. #2
    Registered User
    Join Date
    Mar 2009
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    343
    Convert your struct into into an integer count of days (hours, minutes, seconds, whatever) from some starting point and sort using that value as a key. Look into [ab]using struct tm and mktime() rather than rolling your own to save you some grief.

  3. #3
    Registered User
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    Mar 2011
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    546
    with the standard library function qsort you can pass it an array of your structures and a pointer to a function that does the comparison. you write that function and in it you do the comparisons in the order year,month,day. the hard part is you have a string for month so you would have to translate those strings to something that gives you the order. a lookup table or something.
    laserlight likes this.

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