diff --git a/cpp09/ex01/RPN.cpp b/cpp09/ex01/RPN.cpp
index a33286a..466aea0 100644
--- a/cpp09/ex01/RPN.cpp
+++ b/cpp09/ex01/RPN.cpp
@@ -1,73 +1,77 @@
 #include "RPN.hpp"
 
-bool	RPN::parseInput( std::string const &input )
+bool RPN::parseInput(std::string const &input)
 {
-	std::stringstream	ss(input);
-	std::string			token;
+	std::stringstream ss(input);
+	std::string token;
+	bool firstToken = false;
 
-	while ( ss >> token )
+	while (ss >> token)
 	{
-		if ( token.length() != 1 )
-			return ( false );
-		if ( !isdigit(token[0]) && token != "+" && token != "-" && token != "*" && token != "/" )
-			return ( false );
+		firstToken = true;
+		if (token.length() != 1)
+			return (false);
+		if (!isdigit(token[0]) && token != "+" && token != "-" && token != "*" && token != "/")
+			return (false);
 	}
-	return ( true );
+	return (firstToken);
 }
 
-int	RPN::convertInt( std::string const &digitStr )
+int RPN::convertInt(std::string const &digitStr)
 {
-	std::stringstream	ss(digitStr);
-	int					value;
+	std::stringstream ss(digitStr);
+	int value;
 
 	ss >> value;
 	if (ss.fail())
-		throw ( RPNInputException() );
-	return ( value );
+		throw(RPNInputException());
+	return (value);
 }
 
-int		RPN::calcOperation( int val1, int val2, std::string const &symbol )
+int RPN::calcOperation(int val1, int val2, std::string const &symbol)
 {
-	if ( symbol == "+" )
-		return ( val1 + val2 );
-	if ( symbol == "-" )
-		return ( val1 - val2 );
-	if ( symbol == "*" )
-		return ( val1 * val2 );
-	if ( symbol == "/" )
+	if (symbol == "+")
+		return (val1 + val2);
+	if (symbol == "-")
+		return (val1 - val2);
+	if (symbol == "*")
+		return (val1 * val2);
+	if (symbol == "/")
 	{
-		if ( val2 == 0 )
-			throw ( RPNInputException() );
-		return ( val1 / val2 );
+		if (val2 == 0)
+			throw(RPNInputException());
+		return (val1 / val2);
 	}
-	throw ( RPNInputException() );
+	throw(RPNInputException());
 }
 
-char const	*RPN::RPNInputException::what( void ) const throw()
+char const *RPN::RPNInputException::what(void) const throw()
 {
-	return ( "Error" );
+	return ("Error");
 }
 
-void	RPN::compute( std::string const &input )
+void RPN::compute(std::string const &input)
 {
-	std::stack<int>	buffer;
-	std::stringstream	ss(input);
-	std::string			token;
+	std::stack<int> buffer;
+	std::stringstream ss(input);
+	std::string token;
 
-	if ( !parseInput( input ) )
-		throw ( RPNInputException() );
-	while ( ss >> token )
+	if (!parseInput(input))
+		throw(RPNInputException());
+	while (ss >> token)
 	{
-		if ( isdigit(token[0]) )
+		if (isdigit(token[0]))
 		{
-			buffer.push( convertInt( token ) );
-			continue ;
+			buffer.push(convertInt(token));
+			continue;
 		}
-		if ( buffer.empty() )
-			throw ( RPNInputException() );
-		int		val1 = buffer.top(); buffer.pop();
-		int		val2 = buffer.top(); buffer.pop();
-		buffer.push( calcOperation( val2, val1, token ) );
+		if (buffer.empty())
+			throw(RPNInputException());
+		int val1 = buffer.top();
+		buffer.pop();
+		int val2 = buffer.top();
+		buffer.pop();
+		buffer.push(calcOperation(val2, val1, token));
 	}
 	std::cout << buffer.top() << std::endl;
 }
diff --git a/cpp09/ex01/main.cpp b/cpp09/ex01/main.cpp
index a3d3518..8df0ef3 100644
--- a/cpp09/ex01/main.cpp
+++ b/cpp09/ex01/main.cpp
@@ -1,19 +1,19 @@
 #include "RPN.hpp"
 
-int	main( int argc, char **argv )
+int main(int argc, char **argv)
 {
-	if ( argc != 2 )
+	if (argc != 2)
 	{
 		std::cout << "No input." << std::endl;
-		return ( 0 );
+		return (0);
 	}
 	try
 	{
-		RPN::compute( argv[1] );
+		RPN::compute(argv[1]);
 	}
-	catch ( RPN::RPNInputException const &e )
+	catch (RPN::RPNInputException const &e)
 	{
 		std::cout << e.what() << std::endl;
 	}
-	return ( 0 );
+	return (0);
 }
\ No newline at end of file