feat: add main function to evaluate RPN expressions from command-line input

Author: facetint

ex01/main.cpp

@@ -0,0 +1,25 @@
+#include "RPN.hpp"
+
+int main(int ac, char** av)
+{
+    if (ac < 2) {
+        std::cerr << "Error: Invalid number of arguments." << std::endl;
+        return 1;
+    }
+    std::string expression;
+    for (int i = 1; i < ac; ++i)
+    {
+        expression += av[i];
+        if (i < ac - 1)
+            expression += " ";
+    }
+    try {
+        int result = RPN::evaluate(expression);
+        
+        std::cout << "Result: " << result << std::endl;
+    } catch (const std::exception &e) {
+        std::cerr << e.what() << std::endl;
+        return 1;
+    }
+    return 0;
+}