Lua约分：最大公约数的分数化简

local function gcd(a, b)
    while b ~= 0 do
        a, b = b, a % b
    end
    return a
end

local function reduce(num, den)
    if den == 0 then return nil, nil end
    local g = gcd(num, den)
    return num / g, den / g
end
local p = getplayerbyname("frac01")
local n, d = reduce(462, 1078)
sendmsg(p, 1, "462/1078 = " .. n .. "/" .. d)