diff --git a/calculator.py b/calculator.py
index e224e9d..e7131e8 100644
--- a/calculator.py
+++ b/calculator.py
@@ -12,6 +12,8 @@ def print_error(error_code):
 	# List of error codes:
 	# 1 - Invalid characters found in expression
 	# 2 - Unclosed parantheses
+	# 3 - Two operators next to each other
+	# 4 - Wrong number formatting (multiple periods)
 
 	match error_code:
 		case 1:
@@ -20,12 +22,16 @@ def print_error(error_code):
 			print("You have an unclosed parantheses in your expression.")
 		case 3:
 			print("You have two operators next to each other.")
+		case 4:
+			print("One of your values is improperly formatted.")
 	
 def check_errors(expr):
+	expr_small = expr.replace(" ", "") # Remove spaces from the string, to make it easier to parse
+
 	# Check if number of opening parantheses is equal to number of closing parantheses
 	num_open_pars = 0
 	num_close_pars = 0
-	for val in expr:
+	for index,val in enumerate(expr_small):
 		if not re.match(valid_chars, val):
 			return 1
 
@@ -33,13 +39,24 @@ def check_errors(expr):
 		num_close_pars = num_close_pars+1 if val == ')' else num_close_pars
 
 		if val in opers:
-			#Check if the next element is an operator. If it is, throw an error
-			continue
+			if expr_small[index + 1] in opers: # Two consecutive operators
+				return 3
+
+		if val == '.':
+			if not expr_small[index + 1].isdigit():  # If you have a period, you must have a number after it
+				return 4
+
 
 	if num_open_pars != num_close_pars:
 		return 2
 
 
+
+	expr = parse(expr)
+	for val in expr:
+		if val.count('.') > 1:
+			return 4
+
 	return 0