adding cs235

cs235/lab05/deque.cpp

@@ -0,0 +1,60 @@
+#include "deque.h"
+
+bool deque::addToDequeLeft(int id) {
+    if(in_deque(id)) {
+        return false;
+    }
+    l.insertHead(id);
+    return true;
+}
+
+bool deque::addToDequeRight(int id) {
+    if(in_deque(id)) {
+        return false;
+    }
+    l.insertTail(id);
+    return true;
+}
+
+int deque::removeFromDequeLeft() {
+    int id = l.at(l.size() - 1);
+    l.remove(id);
+    return true;
+}
+
+int deque::removeFromDequeRight() {
+    int id = l.at(0);
+    l.remove(id);
+    return false;
+}
+
+int deque::showTopOfDequeLeft() {
+    if(l.size() == 0) {
+        return -1;
+    }
+    int left = l.at(l.size() - 1);
+    return left;
+}
+
+int deque::showTopOfDequeRight() {
+    if(l.size() == 0) {
+        return -1;
+    }
+    int right = l.at(0);
+    return right;
+}
+
+int deque::showSizeOfDeque() {
+    return l.size();
+}
+
+bool deque::in_deque(int id) {
+    node* node_ptr = l.head;
+    while(node_ptr != NULL) {
+        if(node_ptr->id == id) {
+            return true;
+        }
+        node_ptr = node_ptr->next;
+    }
+    return false;
+}