Trailing Zeros

# Trailing Zeros drill

function bin(x::Integer)::String
    if x < 0; return string(-parse(Int64, bin(-x))); end
    if x == 0; return "0"; end
    L = log(2, x)
    n = ceil(Int64, L)
    if L == n; n += 1; end
    Y = Array{Int8}(undef, n)

    for i = n:-1:1
        x_ = div(x, 2)
        Y[i] = x - 2x_
        x = x_
    end

    return join(Y)
end

function main1(x::Integer)::Int64
    b = bin(x)
    c = 0

    for i = length(b):-1:1
        b[i] == '0' ? c += 1 : break
    end

    return c
end

function main2(x::Integer)::Int64
    c = 0
    d = 1

    for i = 1:floor(Int64, log(2,x))
        d *= 2
        x % d == 0 ? c += 1 : break
    end

    return c
end