prevpow
prevpow(a, x)
The largest a^n
not greater than x
, where n
is a nonnegative integer. a
must be greater than 1, and x
must not be less than 1.
Examples

Find the largest power of a not greater than x:
julia> prevpow(2, 10) 8
This example calculates the largest power of 2 that is not greater than 10.

Calculate the previous power of a larger number:
julia> prevpow(3, 20) 9
It returns the largest power of 3 that is not greater than 20.
 Handle edge cases when x is equal to a^n:
julia> prevpow(4, 64) 64
It correctly handles the case where x is equal to a^n.
Common mistake example:
julia> prevpow(1, 5)
ERROR: ArgumentError: `a` must be greater than 1
In this example, the value of a is less than 1, which is not allowed. Make sure to provide a value of a that is greater than 1 to avoid such errors.
See Also
User Contributed Notes
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