добавил argc argv

main.cpp

@@ -30,8 +30,16 @@ input_data(istream& inn, bool prompt)
 }
 
 int
-main()
+main(int argc, char* argv[])
 {
+    if (argc > 1)
+    {
+        cerr << argc;
+        for(int i = 0; i < argc; i++){
+            cerr << "argv[" << i << "] = " << argv[i];
+        }
+        return 0;
+    }
 
 	auto in = input_data(cin, true);