Fixed Day6 second star and setup functions to make loading of file easier

2025/Day6/Day6_2nd.lua

@@ -0,0 +1,45 @@
+-- Day 6 Lua
+--
+require("functions")
+local input_file = "Day6/full"
+local input = file_characters_to_table(input_file)
+local rows = tablelength(input)
+local cols = tablelength(input[1])
+local grandtotal = 0
+
+local math = {}
+for col = cols, 1, -1 do
+	local num = ""
+	local calc = ""
+	for row = 1, rows do
+		-- print("Checking R" .. row .. "C" .. col .. " " .. input[row][col])
+		v = input[row][col]
+		if tonumber(v) ~= nil then
+			num = num .. input[row][col]
+		elseif v == "*" or v == "+" then
+			calc = v
+		end
+	end
+	table.insert(math, tonumber(num))
+	-- print("Adding " .. num)
+	if calc == "*" or calc == "+" then
+		local t = 0
+		for k, v in ipairs(math) do
+			if t == 0 then
+				t = v
+			else
+				if calc == "+" then
+					t = t + v
+				end
+				if calc == "*" then
+					t = t * v
+				end
+			end
+		end
+		print(calc .. " " .. t)
+		grandtotal = grandtotal + t
+		math = {}
+	end
+end
+print()
+print("Grand total = " .. grandtotal)

2025/functions.lua

@@ -0,0 +1,28 @@
+function file_lines_to_table(filename)
+	local file = {}
+	for line in io.lines(filename) do
+		table.insert(file, line)
+	end
+	return file
+end
+
+function file_characters_to_table(filename)
+	local file = {}
+	for line in io.lines(filename) do
+		local lineelements = {}
+		for I = 1, string.len(line) do
+			c = string.sub(line, I, I)
+			table.insert(lineelements, c)
+		end
+		table.insert(file, lineelements)
+	end
+	return file
+end
+
+function tablelength(T)
+	local count = 0
+	for _ in pairs(T) do
+		count = count + 1
+	end
+	return count
+end