solutions are rounded in a somewhat arbitrary fashion...
Your value of pi is wrong.
The problem should specify that the used value for pi is 3.1416 (since this is not its true value), and that we need to use floor with precision of 4 decimal places.
Summing Digits within Text
Convert from Base 10 to base 5
Set the array elements whose value is 13 to 0
Find the nearest integer
Perfect Square or not
Throw common elements of two vector arrays in sorted manner
Is it prime?
Change number representation to HEX
Roots of quadratic equation
Find Month & day for given day number of a year
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