Leap year checker Calculator

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Checkes if a given year is leap year or not.

Leap year checker
Year
    3. (1582～)
    1.  
[ Algorithm ]
if year is not divisible by 4 then it is a common year
else if year is not divisible by 100 then it is a leap year
else if year is not divisible by 400 then it is a common year
else it is a leap year
    Leap year checker
    [1-4] /4Disp-Num
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    [1]  2020/01/05 03:13   Male / 20 years old level / High-school/ University/ Grad student / Useful /
    Purpose of use
    Learning to code example.
    [2]  2019/10/29 20:50   Male / 20 years old level / Self-employed people / Useful /
    Purpose of use
    Curiosity
    [3]  2019/09/01 14:07   Male / 20 years old level / High-school/ University/ Grad student / Not at All /
    Comment/Request
    (1700 % 4 == 0) and (1700 % 100 != 0) is not leap year
    but why (170 % 4 == 0) and (1704 % 100 != 0) is leap year,,
    Please,, answer me,,
    from Keisan
    (year % 4 == 0) and (year % 100 != 0) is a leap year.
    [4]  2019/07/31 13:40   Male / 30 years old level / An engineer / Very /
    Purpose of use
    Learning to code

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