Leap Year

[VENU YAMAJALA <venu_yamajala@xxxxxxxxxxxx>]

Hi All,

 I want to know the fool-proof method of determining the leap year
technique. My earlier logic was :

Divide CCYY by 400.
If divisible then it is leap year, else
Divide CCYY by 100.
If divisible then it is leap year, else
Divide CCYY by 4.
If divisible, then it is leap year, else it is not a leap year.

But this is not working for years 1900, 1800, 1700, 2100...etc. Sometime back
someone in a meeting pointed out that though 1900...etc are divisible by 100, 4
they are not leap years!!! I heard someone saying that for every 400 turns of
the century (means years with 1600, 2000, 2400...etc), they are leap years and
all other 100s are not (1900, 1800..etc). With this variation in mind, I am
coming out with a new algorithm that says :

Divide CCYY by 400.
If divisible then it is a leap year, else
Divide CCYY by 4
If divisible then it is a leap year, else it is not a leap year.

 I want to know from the list, whether this new variation is the
fool-proof technique. If not, I would like to know the one.
Thanx in advance for any suggestions.

Rgds
Vg
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