adding lab 9

labs/09_maps/phonebook.cpp

@@ -0,0 +1,34 @@
+// A simple "caller ID" program
+
+#include <iostream>
+#include <vector>
+#include <string>
+using namespace std;
+
+// add a number, name pair to the phonebook
+void add(vector<string> &phonebook, int number, string const& name) {
+  phonebook[number] = name;
+}
+
+// given a phone number, determine who is calling
+void identify(const vector<string> & phonebook, int number) {
+  if (phonebook[number] == "UNASSIGNED") 
+    cout << "unknown caller!" << endl;
+  else 
+    cout << phonebook[number] << " is calling!" << endl;
+}
+
+
+int main() {
+  // create the phonebook; initially all numbers are unassigned
+  vector<string> phonebook(10000, "UNASSIGNED");
+
+  // add several names to the phonebook
+  add(phonebook, 1111, "fred");
+  add(phonebook, 2222, "sally");
+  add(phonebook, 3333, "george");
+
+  // test the phonebook
+  identify(phonebook, 2222);
+  identify(phonebook, 4444);
+}