Lua的幾道簡單練習題

--MaoPaoSort
--[[ local a = {1,2,6,3,6,7,5,34,7}
function MaoPaoSort()
    for i = 1, #a - 1 do
        for j = 1, #a - i do
            if(a[j] > a[j + 1]) then
                local temp = a[j]
                a[j] = a[j + 1]
                a[j + 1] = temp
            end
        end
    end
end

MaoPaoSort(a);
for _,v in pairs(a) do
    print(v)
end
--]]

--多返回值，多參數函數
--[[
function Muti(...)
    local t = {}
    for i,v in pairs{...} do
        t[i] = v
    end
    return t;
end

local a = Muti("first", "second", "third")

for k,v in ipairs(a)  do
    print(k, v)
end

function Muti2()
    local a = 1
    local b = 2
    local c = 3
    local d = 4
    return a,b,c,d
end

print(Muti2())
--]]

--斐波那契數列遞歸和迭代寫法
--[[
function Digui(value)
    if(value == 1 or value == 2) then
        return 1
    else
        return Digui(value - 1) + Digui(value - 2)
    end
end

function  DieDai(value)
    local a = {};
    a[1] = 1
    a[2] = 1
    for i = 3, 10 do
        a[i] = a[i -1] + a[i - 2]
    end
    return a[value]
end

for i = 1, 6 do
    print(Digui(i))
    print(DieDai(i))
end
--]]

--99乘法表
--[[
function X99()
    local s = ""
    for i = 1,9 do
        for j = 1, 9 do
            if(j <= i) then
                s = s .. i .. "*" .. j .. "=" .. i*j .. "|"
            end
        end
        s = s .. "\n"
    end
    print(s)
end

X99()

--]]

--自己的迭代器，函數閉包
--[[
local a = {1,2,3,4}

function Iter(t)
    local cnt = 0
    local len = #t
    return function()
        cnt = cnt + 1
        if(cnt <= len) then
            return t[cnt]
        else
            cnt = 1;
            return t[cnt];
        end
        end
end

local f = Iter(a);
print(f())
print(f())
print(f())
print(f())
print(f())
--]]