local i
local x
local y
local amount
local n 40
local b = n/2
local r = 100
local v = {}
local m = {}


-- Stampa del bordo X
function StampaBordoX()
    i = 0;
    write("+")
    while i < b do
        write("----+")
        i = i + 1
    end
    print()
end

-- Equivalente del printf in lua
function comma_value(amount)
    local formatted, k = amount, 0
    while true do
        formatted, k = string.gsub(formatted, "^(-?%d+)(%d%d%d)", '%1,%2')
        if (not k) or k==0 then
            break
        end
    end
    return formatted
end

i = 0
for i=1,b do
    v[i] = math.random(1,r)
end

-- Assegnamento della matrice
x = 0
StampaBordoX()
while x < b do
    y = 0
    write("|")
    while y < b do
        m[x][y] = v[math.random(1,n)]
        comma_value(m[x][y])
        y = y + 1
    end
    print()
    StampaBordoX()
    x = x + 1
end