Ok, thanks!

If the year is 2001, this code still provides the correct answer.

there is smth i want to point on:
what if the year is 2001?
But still it's a nice code !

mastercalss

I wrote down on a sheet of paper and started calculation ! and yea its right !

awesome, i never would have thought of it that way.

If it was >= then v could take the v = 0 value in the condition and then you would indeed have a division by 0. Without the = sign, the condition goes to the else part and no division by zero is performed.

this gives error when v is 0. should be >=

I had this issue as well there is a different function that avoids the rounding issue

because the tests are shit and do not assert correctly floating point values...

edit: now it would work