Finally an actual Main

I wanted to give the calculator a way to be usable

Author: morph-eos

C-String-Calculator-Kata.cpp

@@ -1,10 +1,57 @@
 #include <iostream>
+#include <fstream>
 #include <string>
 #include "./add.h"
 
 using namespace std;
 
-int main(string numbers)
-{
-    return add("0");
+int main() {
+    // Display menu options
+    cout << "Choose an option:" << endl;
+    cout << "1. Enter the string manually" << endl;
+    cout << "2. Load the string from the input.txt file" << endl;
+
+    // Get user choice
+    int choice;
+    cin >> choice;
+
+    // Variable to store input string
+    string inputString;
+
+    // Handle user choice
+    if (choice == 1) {
+        // Manually enter the string
+        cout << "Enter the string: ";
+        cin >> inputString;
+    }
+    else if (choice == 2) {
+        // Load the string from the input.txt file
+        ifstream inputFile("input.txt");
+
+        // Check if the file is open
+        if (!inputFile.is_open()) {
+            cerr << "Error opening the input.txt file." << endl;
+            return 1;
+        }
+
+        // Read the string from the file
+        getline(inputFile, inputString);
+    }
+    else {
+        // Invalid choice, exit with an error message
+        cerr << "Invalid choice. Exiting." << endl;
+        return 1;
+    }
+
+    try {
+        // Call the add function and display the result
+        cout << "Result: " << add(inputString) << endl;
+    }
+    catch (const exception& e) {
+        // Handle exceptions and display error message
+        cerr << "Error: " << e.what() << endl;
+        return 1;
+    }
+
+    return 0;
 }