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if #arg == 0 then
io.stderr:write('No args provided!')
os.exit(1)
end
if tonumber(arg[1]) > 9 then
io.stderr:write('Number must be less than 10!')
os.exit(1)
end
function first_to_upper(str)
return (str:gsub("^%l", string.upper))
end
function four_is_magic(n)
assert(type(n) == "number", "n must be a number!")
local t = {'one', 'two', 'three', 'four', 'five', 'six', 'seven',
'eight', 'nine'}
local tbl, len = {}, #t[n]
repeat
tbl[#tbl+1] = t[n] .. ' is ' .. t[len]
n = len
len = #t[n]
until n == 4
tbl[#tbl+1] = 'four is magic.'
return first_to_upper(table.concat(tbl, ', '))
end
print(four_is_magic(tonumber(arg[1])))
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