--This is 2 simple function to transform some number (under 255) to hexadecimal number and in the other way.
--This is made for PICO-8

function dec_to_hexa(dec)
	local hex="0123456789abcdef"
	local sortie=""
	sortie=sortie..sub(hex,flr(dec%16)+1,flr(dec%16)+1)
	dec=flr((dec/16))
	sortie=sub(hex,(dec%16)+1,(dec%16)+1)..sortie
	return sortie
end

function hexa_to_dec(hexa)
	local hex="0123456789abcdef"
	local sortie=0

	for i=-2,-1 do
		for l=1,16 do
			if sub(hex,l,l)==sub(hexa,i,i) then
				sortie=16^(abs(i)-1)*(l-1)+sortie
			end
		end
	end

	return sortie
end

entree=25

print(dec_to_hexa(entree))
print(hexa_to_dec(dec_to_hexa(entree)))