Implement RPN class with evaluation logic, exception handling, and main function; update PmergeMe class to track comparisons and enhance input validation

.gitignore

@@ -1,4 +1,5 @@
 .cache
 *.d
 *.o
-PmergeMe
+PmergeMe
+RPN

.vscode/settings.json

@@ -52,6 +52,8 @@
 		"iomanip": "cpp",
 		"sstream": "cpp",
 		"*.tpp": "cpp",
-		"chrono": "cpp"
+		"chrono": "cpp",
+		"list": "cpp",
+		"ratio": "cpp"
 	}
 }

ex01/Makefile

@@ -0,0 +1,2 @@
+NAME := RPN
+include ../common.mk

ex01/inc/RPN.hpp

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <string>
+#include <stack>
+
+class RPN
+{
+public:
+	RPN();
+	RPN(std::string expression);
+	RPN(const RPN &other);
+	~RPN();
+	RPN &operator=(const RPN &other);
+	void setExpression(std::string expression);
+	int evaluate();
+
+	class NoExpressionException : public std::exception
+	{
+	public:
+		const char *what() const noexcept override;
+	};
+
+	class InvalidExpressionException : public std::exception
+	{
+	public:
+		const char *what() const noexcept override;
+	};
+
+	class DivisionByZeroException : public std::exception
+	{
+	public:
+		const char *what() const noexcept override;
+	};
+
+	class InvalidCharacterException : public std::exception
+	{
+	public:
+		const char *what() const noexcept override;
+	};
+
+private:
+	std::string _expression;
+
+	bool isWellformed() const;
+	bool isOperator(char c) const;
+	int applyOperator(int a, int b, char op) const;
+	void printStack(std::stack<int> stack) const;
+};

ex01/src/RPN.cpp

@@ -0,0 +1,172 @@
+#include "RPN.hpp"
+
+#include <algorithm>
+#include <stdexcept>
+#include <stack>
+#include <iostream>
+
+RPN::RPN() : _expression("")
+{
+}
+
+RPN::RPN(std::string expression) : _expression(expression)
+{
+}
+
+RPN::RPN(const RPN &other) : _expression(other._expression)
+{
+}
+
+RPN::~RPN()
+{
+}
+
+RPN &RPN::operator=(const RPN &other)
+{
+	if (this != &other)
+	{
+		_expression = other._expression;
+	}
+	return *this;
+}
+
+void RPN::setExpression(std::string expression)
+{
+	_expression = expression;
+}
+
+int RPN::evaluate()
+{
+	if (_expression.empty())
+		throw RPN::NoExpressionException();
+	if (!isWellformed())
+		throw RPN::InvalidExpressionException();
+	std::stack<int> stack;
+	for (char c : _expression)
+	{
+		if (std::isspace(c))
+			continue;
+		if (std::isdigit(c))
+			stack.push(c - '0');
+		else if (isOperator(c))
+		{
+			if (stack.size() < 2)
+				throw RPN::InvalidExpressionException();
+
+			int b = stack.top();
+			stack.pop();
+			int a = stack.top();
+			stack.pop();
+			int result = applyOperator(a, b, c);
+			stack.push(result);
+		}
+		else
+		{
+			throw RPN::InvalidCharacterException();
+		}
+		// std::cout << "Stack after processing '" << c << "': ";
+		// printStack(stack);
+	}
+	if (stack.size() != 1)
+		throw RPN::InvalidExpressionException();
+	return stack.top();
+}
+
+bool RPN::isWellformed() const
+{
+	bool needs_space = false;
+	for (char c : _expression)
+	{
+		if (std::isspace(c))
+		{
+			if (needs_space)
+				needs_space = false;
+			continue;
+		}
+		if (std::isdigit(c) || isOperator(c))
+		{
+			if (needs_space)
+				return false;
+			needs_space = true;
+		}
+		else
+		{
+			return false;
+		}
+	}
+	return true;
+}
+
+bool RPN::isOperator(char c) const
+{
+	if (std::string("+-*/").find(c) != std::string::npos)
+		return true;
+	return false;
+}
+
+int RPN::applyOperator(int a, int b, char op) const
+{
+	switch (op)
+	{
+	case '+':
+		return a + b;
+	case '-':
+		return a - b;
+	case '*':
+		return a * b;
+	case '/':
+		if (b == 0)
+			throw RPN::DivisionByZeroException();
+		return a / b;
+	default:
+		throw RPN::InvalidExpressionException();
+
+		return 0;
+	}
+}
+
+void RPN::printStack(std::stack<int> stack) const
+{
+	if (stack.empty())
+	{
+		std::cout << "[]\n";
+		return;
+	}
+
+	std::stack<int> temp;
+	while (!stack.empty())
+	{
+		temp.push(stack.top());
+		stack.pop();
+	}
+
+	std::cout << "[";
+	while (!temp.empty())
+	{
+		std::cout << temp.top();
+		temp.pop();
+		if (!temp.empty())
+			std::cout << ", ";
+	}
+	std::cout << "]\n";
+}
+
+const char *RPN::NoExpressionException::NoExpressionException::what() const noexcept
+{
+	return "No expression provided.";
+}
+
+const char *RPN::InvalidExpressionException::InvalidExpressionException::what() const noexcept
+{
+	return "Invalid RPN expression.";
+}
+
+const char *RPN::DivisionByZeroException::DivisionByZeroException::what() const noexcept
+{
+	return "Division by zero.";
+}
+
+const char *RPN::InvalidCharacterException::InvalidCharacterException::what() const noexcept
+{
+	return "Invalid character in expression.";
+}

ex01/src/main.cpp

@@ -0,0 +1,25 @@
+#include "RPN.hpp"
+#include <iostream>
+
+int main(int argc, char **argv)
+{
+	if (argc != 2)
+	{
+		std::cerr << "Usage: " << argv[0] << " <RPN expression>" << std::endl;
+		return 1;
+	}
+
+	try
+	{
+		RPN rpn(argv[1]);
+		int result = rpn.evaluate();
+		std::cout << result << std::endl;
+	}
+	catch (const std::exception &e)
+	{
+		std::cerr << "Error: " << e.what() << std::endl;
+		return 1;
+	}
+
+	return 0;
+}

ex02/inc/PmergeMe.hpp

@@ -18,6 +18,7 @@ public:
 
     void sort();
     std::string getString() const;
+    int getComparisons() const;
 
 private:
     Container _data;

ex02/inc/PmergeMe.tpp

@@ -13,12 +13,14 @@
 #include <vector>
 #include <chrono>
 
-
-template<typename T>
-std::string getTypeName() {
-    if (std::is_same_v<T, std::vector<int>>) return "std::vector<int> ";
-    if (std::is_same_v<T, std::deque<int>>) return "std::deque<int>  ";
-    return typeid(T).name(); // fallback to mangled name
+template <typename T>
+std::string getTypeName()
+{
+	if (std::is_same_v<T, std::vector<int>>)
+		return "std::vector<int> ";
+	if (std::is_same_v<T, std::deque<int>>)
+		return "std::deque<int>  ";
+	return typeid(T).name(); // fallback to mangled name
 }
 
 template <typename Container>
@@ -27,13 +29,24 @@ PmergeMe<Container>::PmergeMe(const int argc, const char **argv) : _comparisons(
 	for (int i = 1; argv[i] != nullptr; ++i)
 	{
 		size_t pos;
-		int value = std::stoi(argv[i], &pos);
-		if (value < 0)
-			throw std::invalid_argument("All inputs must be non-negative integers");
-		if (pos != std::strlen(argv[i]))
-			throw std::invalid_argument("Invalid input: not a valid integer");
+		try
+		{
+			int value = std::stoi(argv[i], &pos);
+			if (value < 0)
+				throw std::invalid_argument("All inputs must be non-negative integers");
+			if (pos != std::strlen(argv[i]))
+				throw std::invalid_argument("Invalid input: not a valid integer");
 
-		_data.push_back(value);
+			_data.push_back(value);
+		}
+		catch (const std::out_of_range &e)
+		{
+			throw std::out_of_range("Input value out of range");
+		}
+		catch (const std::invalid_argument &e)
+		{
+			throw std::invalid_argument("Invalid input: not a valid integer");
+		}
 	}
 
 	if (!areAllUnique())
@@ -93,6 +106,12 @@ std::string PmergeMe<Container>::getString() const
 	return result;
 }
 
+template <typename Container>
+int PmergeMe<Container>::getComparisons() const
+{
+	return _comparisons;
+}
+
 template <typename Container>
 bool PmergeMe<Container>::less(int a, int b)
 {
@@ -198,4 +217,3 @@ std::ostream &operator<<(std::ostream &os, const PmergeMe<Container> &obj)
 
 	return os;
 }
-

ex02/src/PmergeMe.cpp

@@ -1,26 +0,0 @@
-#include "PmergeMe.hpp"
-#include <algorithm>
-#include <cmath>
-#include <cstring>
-#include <deque>
-#include <iomanip>
-#include <iostream>
-#include <stdexcept>
-#include <string>
-#include <vector>
-#include <chrono>
-
-std::ostream &operator<<(std::ostream &os, const std::vector<int> &obj)
-{
-	for (std::vector<int>::const_iterator it = obj.begin(); it != obj.end(); ++it)
-	{
-		if (it != obj.begin())
-			os << " ";
-		os << *it;
-	}
-
-	return os;
-}
-
-
-

ex02/src/main.cpp

@@ -10,12 +10,14 @@ int main(const int argc, const char **argv)
 
     try
     {
-        PmergeMe<std::vector<int> > sorter(argc, argv);
-        std::cout << "Before: " << sorter << std::endl;
-        sorter.sort();
+        PmergeMe<std::vector<int> > sorter_vector(argc, argv);
+        std::cout << "Before: " << sorter_vector << std::endl;
+        sorter_vector.sort();
         PmergeMe<std::deque<int> > sorter_deque(argc, argv);
         sorter_deque.sort();
         std::cout << "After: " << sorter_deque << std::endl;
+        std::cout << "Total comparisons (vector): " << sorter_vector.getComparisons() << std::endl;
+        std::cout << "Total comparisons (deque): " << sorter_deque.getComparisons() << std::endl;
 
     }
     catch (const std::invalid_argument &e)
@@ -23,6 +25,16 @@ int main(const int argc, const char **argv)
         std::cerr << "Error: " << e.what() << std::endl;
         return 1;
     }
+    catch (const std::out_of_range &e)
+    {
+        std::cerr << "Error: "<< e.what() << std::endl;
+        return 1;
+    }
+    catch (const std::exception &e)
+    {
+        std::cerr << "Unexpected error: " << e.what() << std::endl;
+        return 1;
+    }
 
     return 0;
 }