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c++cdatecomparison

How to compare day/month/year in C or C++?

I have a program that asks the user to input to dates then it displays which one is more recent I've done it like this 

if (year1>year2 || month1>month2 || day1>day2)
    return -1;

if (year1<year2 || month1<month2 || day1<day2)
    return +1;

but the output is not quite correct.

Solution

  • You need a much more complicated check than that:

    if (year1 > year2)
    return -1;
else if (year1 < year2)
    return +1;

if (month1 > month2)
    return -1;
else if (month1 < month2)
    return +1;

if (day1 > day2)
    return -1;
else if (day1 < day2)
    return +1;

return 0;

    NOTE: Returning -1 for first is greater than second seems counter-intuititive to me, however I have followed the semantics provided by the OP.