Weird Stuff. Lua

local exponent = 4
local biased_exp = 1027
print("Exponent: ".. exponent, "biased exp: ".. biased_exp)

for i = 10, 0, -1 do
    local bitvalue = 2^i
    print("\t".."Exponent bit: ".. i)
    if i > 3 and biased_exp >= bitvalue then
        print("\t\t".."Exponent is bigger than bitvalue: ".. biased_exp .. ">=".. bitvalue, "2^"..(i-4))
        ---
        local bexp_int, bexp_fra = math.modf(biased_exp)
        local bitval_int, bitval_fra = math.modf(bitvalue)
        print("\t\t".."Biased exp int: ".. bexp_int, "fraction: ".. bexp_fra)
        print("\t\t".."Bitval int: ".. bitval_int, "fraction: ".. bitval_fra)
        print("\t\t".."==", bexp_int == bitval_int, bexp_frac == bitval_frac)
        print("\t\t"..">=", bexp_int >= bitval_int, bexp_frac >= bitval_frac)
        print("\t\t".."> ", bexp_int >  bitval_int, bexp_frac >  bitval_frac)
        ---
        biased_exp = biased_exp - bitvalue

    elseif exponent >= bitvalue then
        print("Exponent is bigger than bitvalue: ".. biased_exp .. ">=".. bitvalue, "2^"..(i+4))

        biased_exp = biased_exp - bitvalue
    end
end

print("Biased Exponent should equal zero: ".. biased_exp)