Lua石头剪刀布：循环相克的取余判定

local function judgeBranch(a, b)
    if a == b then return "平" end
    if (a == 0 and b == 1) or (a == 1 and b == 2)
        or (a == 2 and b == 0) then
        return "先手胜"
    end
    return "后手胜"
end

local NAMES = {"石头", "剪刀", "布"}
local function judge(a, b)
    local r = (a - b + 3) % 3
    return r == 0 and "平"
        or (r == 1 and "先手胜" or "后手胜")
end
local p = getplayerbyname("rps01")
for i = 0, 2 do
    sendmsg(p, 1, NAMES[i] .. " 对 "
        .. NAMES[(i + 1) % 3] .. "："
        .. judge(i, (i + 1) % 3))
end