diff --git a/ex00/BitcoinExchange/BitcoinExchange.cpp b/ex00/BitcoinExchange/BitcoinExchange.cpp
index cc0d884..6755c56 100644
--- a/ex00/BitcoinExchange/BitcoinExchange.cpp
+++ b/ex00/BitcoinExchange/BitcoinExchange.cpp
@@ -63,8 +63,116 @@ void	BitcoinExchange::readDatabase(std::ifstream &db)
 		date = line.substr(0, pos);
 		price = line.substr(pos + 1);
 
-
 		this->data[date] = std::strtod(price.c_str(), NULL);
 	}
+}
 
+void    BitcoinExchange::execute(std::ifstream &db)
+{
+	std::string line;
+	std::getline(db, line);
+
+	if (line != "date | value")
+		throw std::exception();
+
+	size_t 	pos;
+	std::string	date;
+	std::string	value;
+
+	while (std::getline(db, line))
+	{
+		pos = line.find('|');
+		if (pos == std::string::npos)
+		{
+			cout << "Error: bad input => " << line << endl;
+			continue;
+		}
+		date = line.substr(0, pos - 1);
+		value = line.substr(pos + 2);
+		
+		if (!validateAll(date, value))
+			continue ;
+
+		std::map<std::string, double>::iterator	it = this->data.lower_bound(date);
+		if (it == this->data.begin() && it->first != date)
+		{
+			cout << "Error: bad input => " << date << endl;
+			continue;
+		}
+		if (it->first != date)
+			it--;
+		
+		cout << date << " => " << value << " = " << it->second * std::strtod(value.c_str(), NULL) << endl;
+	}
+}
+
+bool	BitcoinExchange::validateAll(const std::string &date, const std::string &value)
+{
+
+	if (!validateDate(date))
+	{
+		cout << "Error: bad input => " << date << endl;
+		return (false);
+	}
+	else if (validateValue(value) == 2)
+	{
+		cout << "Error: not a positive number." << endl;
+		return (false);
+	}
+	else if (validateValue(value) == 3)
+	{
+		cout << "Error: too large a number." << endl;
+		return (false);
+	}
+	return (true);
+}
+
+bool    BitcoinExchange::validateDate(const std::string &date)
+{
+	int		maxDay = 31;
+	int		year;
+	int		month;
+	int		day;
+	char	dash;
+	bool	bisiesto;
+	
+	
+	if (date.length() != 10 || date[4] != '-' || date[7] != '-')
+		return (false);
+	
+	std::istringstream ss(date);
+	ss >> year >> dash >> month >> dash >> day;
+	bisiesto = ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);
+
+	if (year < 2008)
+		return (false);
+	if (month < 1 || month > 12)
+		return (false);
+	if (month == 2)
+	{
+		if (bisiesto)
+			maxDay = 29;
+		else
+			maxDay = 28;
+	}
+	if (day < 1 || day > maxDay)
+		return (false);
+	
+	return (true);
+
+}
+
+int    BitcoinExchange::validateValue(const std::string &value)
+{
+	char *endptr;
+	double val = std::strtod(value.c_str(), &endptr);
+
+	if (*endptr != '\0')
+    	return (1);
+	if (val < 0)
+		return (2);
+	else if (val > 1000)
+		return (3);
+	return (0);
+	
 }
\ No newline at end of file
diff --git a/ex00/BitcoinExchange/BitcoinExchange.hpp b/ex00/BitcoinExchange/BitcoinExchange.hpp
index 0988260..65fd925 100644
--- a/ex00/BitcoinExchange/BitcoinExchange.hpp
+++ b/ex00/BitcoinExchange/BitcoinExchange.hpp
@@ -25,6 +25,10 @@ class BitcoinExchange
 {
     private:
         std::map<std::string, double>	data;
+        
+        bool	validateAll(const std::string &date, const std::string &value);
+        bool    validateDate(const std::string &date);
+        int    validateValue(const std::string &value);
 
     public:
         BitcoinExchange();
@@ -33,6 +37,7 @@ class BitcoinExchange
         ~BitcoinExchange();
 
 		void	readDatabase(std::ifstream &db);
+        void    execute(std::ifstream &db);
 };
 
 #endif
diff --git a/ex00/BitcoinExchange/BitcoinExchange.o b/ex00/BitcoinExchange/BitcoinExchange.o
deleted file mode 100644
index db721ec..0000000
Binary files a/ex00/BitcoinExchange/BitcoinExchange.o and /dev/null differ
diff --git a/ex00/btc b/ex00/btc
deleted file mode 100755
index 08e38be..0000000
Binary files a/ex00/btc and /dev/null differ
diff --git a/ex00/input.txt b/ex00/input.txt
new file mode 100644
index 0000000..f9b4147
--- /dev/null
+++ b/ex00/input.txt
@@ -0,0 +1,10 @@
+date | value
+2011-01-03 | 3
+2011-01-03 | 2
+2011-01-03 | 1
+2011-01-03 | 1.2
+2011-01-09 | 1
+2012-01-11 | -1
+2001-42-42
+2012-01-11 | 1
+2012-01-11 | 2147483648
\ No newline at end of file
diff --git a/ex00/main.cpp b/ex00/main.cpp
index 0c24697..56a4918 100644
--- a/ex00/main.cpp
+++ b/ex00/main.cpp
@@ -6,7 +6,7 @@
 /*   By: aortigos <aortigos@student.42malaga.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2026/04/23 19:58:34 by aortigos          #+#    #+#             */
-/*   Updated: 2026/04/23 20:48:10 by aortigos         ###   ########.fr       */
+/*   Updated: 2026/04/24 00:32:28 by aortigos         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -21,18 +21,21 @@ int	main(int argc, char **argv)
 		return (0);
 	}
 	
-	std::ifstream inFile(argv[1]);
+	std::ifstream database("data.csv");
+	std::ifstream inputFile(argv[1]);
 
-	if (!inFile)
+
+	if (!database || !inputFile)
 	{
-		cout << "Error: could not open database." << endl;
+		cout << "Error: could not open file." << endl;
 		return (1);
 	}
 
 	BitcoinExchange bc;
 
 	try {
-		bc.readDatabase(inFile);
+		bc.readDatabase(database);
+		bc.execute(inputFile);
 	} catch (std::exception &e)
 	{
 		std::cout << e.what() << std::endl;
diff --git a/ex00/main.o b/ex00/main.o
deleted file mode 100644
index 91f24e5..0000000
Binary files a/ex00/main.o and /dev/null differ