added guest list example

VL03-02-01/main.cc

@@ -0,0 +1,100 @@
+#include <iostream>
+#include <vector>
+
+void checkGuest(std::vector<std::string> &guests) {
+  std::cout << "Guest: ";
+  std::string guest;
+  std::cin >> guest;
+  bool is_guest = false;
+
+  for (std::vector<std::string>::iterator it = guests.begin(); it != guests.end();) {
+    if (*it == guest) {
+      is_guest = true;
+      break;
+    } else {
+      ++it;
+    }
+  }
+
+  std::cout << guest << " is " << ((is_guest) ? "" : "NOT ") << "on the guest list!" << std::endl;
+}
+
+void createGuest(std::vector<std::string> &guests) {
+  bool keepInput = true;
+
+  do {
+    std::string guest;
+    std::cout << "Guest: ";
+    std::cin >> guest;
+    guests.push_back(guest);
+    std::cout << "More? (1 = Yes - 0 = No) ";
+    std::cin >> keepInput;
+  } while (keepInput);
+}
+
+void removeGuest(std::vector<std::string> &guests) {
+  std::cout << "Guest: ";
+  std::string guest;
+  std::cin >> guest;
+
+  for (std::vector<std::string>::iterator it = guests.begin(); it != guests.end();) {
+    if (*it == guest) {
+      it = guests.erase(it);
+    } else {
+      ++it;
+    }
+  }
+}
+
+void showGuests(std::vector<std::string> &guests) {
+  std::cout << "-- List of all guests --" << std::endl;
+
+  for (std::string &guest : guests) {
+    std::cout << "\t" << guest << std::endl;
+  }
+}
+
+int showMenuSelection() {
+  std::cout << std::endl << std::endl;
+  std::cout << "-- Menu (Guest list manager) --" << std::endl;
+  std::cout << "\t 1 - New guest" << std::endl;
+  std::cout << "\t 2 - Remove guest" << std::endl;
+  std::cout << "\t 3 - Check guest" << std::endl;
+  std::cout << "\t 4 - Show guests" << std::endl;
+  std::cout << "\t 5 - Clear guest list" << std::endl;
+  std::cout << "\t 9 - Exit" << std::endl;
+  std::cout << std::endl << "Selection: ";
+  int selection;
+  std::cin >> selection;
+  return selection;
+}
+
+int main() {
+  std::vector<std::string> guests;
+
+  while (int selection = showMenuSelection()) {
+    switch (selection) {
+      case 1:
+        createGuest(guests);
+        break;
+      case 2:
+        removeGuest(guests);
+        break;
+      case 3:
+        checkGuest(guests);
+        break;
+      case 4:
+        showGuests(guests);
+        break;
+      case 5:
+        guests.clear();
+        std::cout << "The guest list was cleared!" << std::endl;
+        break;
+      case 9:
+        return 0;
+        break;
+    }
+  }
+
+  return 0;
+}