View difference between Paste ID: ehsi2qsY and cK8yZA7K

 --[[
 	Math HW helper thingy.  Features:
 		-distance formula (1D or 2D)
 		-pythagorean theorem
 		-midpoint formula
 
 	MODES:
 		1 : P. Theorem
 		2 : Distance Formula
 		3 : Midpoint Formula
 ]]
 
 local maxMode = 3
 local mode = 0
 
 function comma(amount)
   	local formatted = tostring(amount)
   	while true do
    		formatted, k = string.gsub(formatted, "^(-?%d+)(%d%d%d)", '%1,%2')
-    	if k == 0 then
+    		if k == 0 then
-      		break
+      			break
-    	end
+    		end
   	end
  	return formatted
 end
 
 function round(number)
 	return tostring(number):find("%.") and tostring(number):sub(1, tostring(number):find("%.") + 3) or tostring(number)
 end
 
 function promptReturn()
 	io.write("return to menu? YES/NO -> ")
 	local reply = io.read()
 	if reply:lower():find("yes") then
 		io.write("\n")
 		mode = 0
 	end
 end
 
 function unpackPar(par)
 	local isolate = {}
 	local row = ""
 	local lastChar;
 	par = par:gsub("%s+", "")
 	for char = 1, par:len() do
 		if lastChar then
 			if tonumber(par:sub(char, char)) then
 				row = row .. par:sub(char, char)
 			elseif row:len() > 0 then
 				table.insert(isolate, row)
 				row = ""
 			end
 		end
 		lastChar = par:sub(char, char)
 	end
 	return unpack(isolate)
 end
 
 function handleMath(mode, input)
 	return (
 		mode == 1 and
 			function()
 				local a, b, c;
 				io.write("a -> ") a = io.read()
 				io.write("b -> ") b = io.read()
 				io.write("c -> ") c = io.read()
 				print (
 					a == "?" and
 						"\na = " .. comma(round(math.sqrt((c ^ 2) - (b ^ 2)))) .. " || root( " .. comma((c ^ 2) - (b ^ 2)) .. " )"
 					or b == "?" and
 						"\nb = " .. comma(round(math.sqrt((c ^ 2) - (a ^ 2)))) .. " || root( " .. comma((c ^ 2) - (a ^ 2)) .. " )"
 					or c == "?" and
 						"\nc = " .. comma(round(math.sqrt((a ^ 2) + (b ^ 2)))) .. " || root( " .. comma((a ^ 2) + (b ^ 2)) .. " )"
 					or "\n---> syntax error <---"
 				)
 				promptReturn()
 			end
 		or mode == 2 and
 			function()
 				local coord1, coord2, answer, x1, y1, x2, y2;
 				io.write("point 1 -> ") coord1 = io.read()
 				io.write("point 2 -> ") coord2 = io.read()
 				x1, y1 = unpackPar(coord1)
 				x2, y2 = unpackPar(coord2)
 				answer = ((x2 - x1) ^ 2) + ((y2 - y1) ^ 2)
 				print (
 					not (x1 and y1 and x2 and y2) and
 						"\n---> syntax error <---"
 					or
 						"\ndistance = " .. comma(round(math.sqrt(answer))) .. " || root( " .. comma(answer) .. " ) "
 				)
 				promptReturn()
 			end
 		or mode == 3 and
 			function()
 				local coord1, coord2, answer, type, x1, y1, x2, y2;
 				io.write("Type of midpoint? (1D or 2D) -> ") type = io.read()
 				if type:lower():find("1d") then
 					io.write("position 1 -> ") coord1 = io.read()
 					io.write("position 2 -> ") coord2 = io.read()
 					print (
 						not (tonumber(coord1) and tonumber(coord2)) and
 							"\n---> syntax error <---"
 						or
 							"\nmidpoint = " .. comma(round(0.5 * (tonumber(coord1) + tonumber(coord2))))
 					)
 					promptReturn()
 				else
 					io.write("point 1 -> ") coord1 = io.read()
 					io.write("point 2 -> ") coord2 = io.read()
 					x1, y1 = unpackPar(coord1)
 					x2, y2 = unpackPar(coord2)
 					print (
 						not (x1 and y1 and x2 and y2) and
 							"\n---> syntax error <---"
 						or
 							"\nmidpoint = (" .. comma(round((x1 + x2) / 2)) .. ", " .. comma(round((y1 + y2) / 2)) .. ")"
 					)
 					promptReturn()
 				end
 			end
 	)()
 end
 
 function changeMode(mode)
 	return (tonumber(mode) > -1 and tonumber(mode) <= maxMode) and tonumber(mode) or 0
 end
 
 while true do
 	if mode == 0 then
 		print(
 			"Math HW Helper by David.  Choose a mode:\n" ..
 			"\t1) Pythagorean Theorem\n" ..
 			"\t2) Distance Formula\n" ..
 			"\t3) Midpoint Formula\n"
 		)
 		mode = changeMode(io.read())
 	else
 		handleMath(mode)
 	end
 end