Minor changes

main.cpp

@@ -51,6 +51,14 @@ int main(int argc, char** argv) {
   if (done_c && done_sc && done_cpu) {
     Runtime rt(sc, cpu, c);
     rt.run();
+  } else {
+      std::cerr << "USAGE: The program takes three files, with their specific flags prepending them. Example:\n\n"
+                << "    schdulEd -cpu classes_per_uc.csv -c classes.csv -sc students_classes.csv\n\n"
+                << "Where '-cpu' is the flag that specifies a CSV file which contains the list of classes per each UC\n"
+                << "Where '-c' is the flag that specifies a CSV file which contains the list of classes an their schedules\n"
+                << "Where '-sc' is the flag that specifies a CSV file which contains the list of students and their association with each class\n"
+                << std::endl;
+      std::exit(1);
   }
 
   return 0;

src/Runtime.cpp

@@ -166,10 +166,10 @@ void Runtime::run() {
 
 void Runtime::process_args(std::vector<std::string> args) {
   if (args[0] == "quit") {
-    std::string answer;
+    char answer;
     std::cout << "Do you wish to save any changes you have made? [y/N]" << std::endl;
     std::cin >> std::noskipws >> answer;
-    if (answer == "y") {
+    if (answer == 'y') {
       std::cout << "Saving..." << std::endl;
       this->save_all();
       this->students_classes_->write_to_file();