adding cs142 code

cs142/lab08/person.cpp

@@ -0,0 +1,47 @@
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+#include "person.h"
+
+void person::modify_food(string new_food) {
+    fav_food = new_food;
+}
+
+void person::display_person(vector<person> & p) {
+    for(unsigned int i = 0; i < friends.size(); i++) {
+        for(unsigned int j = 0; j < p.size(); j++) {
+            if(p[j].name == friends[i] and p[j].fav_food == fav_food) {
+                cout << p[j].name << " also likes " << fav_food << endl;
+            }
+        }
+    }
+}
+
+void person::add_friend(string name) {
+    if(not already_friends(name)) {
+        friends.push_back(name);
+    }
+}
+
+bool person::already_friends(string name) {
+    for(unsigned int i = 0; i < friends.size(); i++) {
+        if(friends[i] == name) {
+            return true;
+        }
+    }
+    return false;
+}
+
+void person::delete_friend(string name) {
+    for(unsigned int i = 0; i < friends.size(); i++) {
+        if(friends[i] == name) {
+            friends.erase((friends.begin())+i);
+            break;
+        }
+        else {
+            cerr << "this person does not exist" << endl;
+        }
+    }
+}