[julia-users] hex2num() query

[cormullion]

What's the logic behind the results from `hex2num()`:

    julia> hex2num("1")
    1.0f-45

    julia> hex2num("2")
    3.0f-45

    julia> hex2num("3")
    4.0f-45

    julia> hex2num("A")
    1.4f-44