clang-format and clang-tidy fixes for 5cac47c9

data_structures/reverse_a_linked_list.cpp

@@ -9,19 +9,20 @@
  * the pointers) starting from the first link. Whichever link points to null
  * is considered the last link and is pointed to the new value.
  *
- * Linked List can be reversed by using 3 pointers ,current ,prev and next_node ;
- * We keep iterating till the last node,meanwhile before changing to the next of current ,we store it in  the next_node pointer;
- * now we store the prev pointer in the current of next ,this is where the actual reversal happens,
+ * Linked List can be reversed by using 3 pointers ,current ,prev and next_node
+ * ; We keep iterating till the last node,meanwhile before changing to the next
+ * of current ,we store it in  the next_node pointer; now we store the prev
+ * pointer in the current of next ,this is where the actual reversal happens,
  * And then we move the prev and current pointers one step forward.
- * Then the head node is made to point to the last node (prev pointer) after completion of iteration .
+ * Then the head node is made to point to the last node (prev pointer) after
+ * completion of iteration .
  */
 #include <iostream>
 
 /**
  * A Node class containing a value and pointer to next node;
  */
-class Node
-{
+class Node {
  public:
     int val;     ///< value of the current link
     Node *next;  ///< pointer to the next value on the list
@@ -32,21 +33,18 @@ public:
  * double pointer to the head node of the list to
  * reflect the changes globally in the whole program
  */
-void create(Node **head, int n)
-{
+void create(Node **head, int n) {
     Node *new_node = new Node();
-    Node *temp;
+    Node *temp = nullptr;
     new_node->val = n;
-    new_node->next = NULL;
-    if (*head == NULL)
-    {
+    new_node->next = nullptr;
+    if (*head == nullptr) {
         *head = new_node;
-    }
-    else
-    {
+    } else {
         temp = *head;
-        while (temp->next != NULL)
+        while (temp->next != nullptr) {
             temp = temp->next;
+        }
         temp->next = new_node;
     }
 }
@@ -55,10 +53,8 @@ void create(Node **head, int n)
  * @returns 'void'
  * @param node pointer for traversing the list.
  */
-void printList(Node *node)
-{
-    while (node != NULL)
-    {
+void printList(Node *node) {
+    while (node != nullptr) {
         std::cout << node->val << "\t";
         node = node->next;
     }
@@ -69,12 +65,10 @@ void printList(Node *node)
  * function reverseList for reversing the  list
  * @param double pointer to head node
  */
-void reverseList(Node **head)
-{
+void reverseList(Node **head) {
     Node *curr = *head;
-    Node *prev = NULL, *next_node = NULL;
-    while (curr != NULL)
-    {
+    Node *prev = nullptr, *next_node = nullptr;
+    while (curr != nullptr) {
         next_node = curr->next;
         curr->next = prev;
         prev = curr;
@@ -87,12 +81,10 @@ void reverseList(Node **head)
  * Allows the user add ,display and reverse values from the list.
  * @returns 0 on exit
  */
-int main()
-{
-    int n;
-    Node *head = NULL;
-    while (1)
-    {
+int main() {
+    int n = 0;
+    Node *head = nullptr;
+    while (true) {
         std::cout << "\n1. Insert";
         std::cout << "\n2. Display";
         std::cout << "\n3. Resverse";
@@ -100,32 +92,27 @@ int main()
         std::cout << "\n\nEnter you choice : ";
         std::cin >> n;
 
-        switch (n)
-        {
-        case 1:
-        {
-            int a;
+        switch (n) {
+            case 1: {
+                int a = 0;
                 std::cout << "\nEnter the element to be inserted : ";
                 std::cin >> a;
                 create(&head, a);
 
                 break;
             }
-        case 2:
-        {
+            case 2: {
                 std::cout << "Printing the Linked List\n";
                 std::cout << "\n";
                 printList(head);
 
                 break;
             }
-        case 3:
-        {
+            case 3: {
                 reverseList(&head);
                 break;
             }
-        case 4:
-        {
+            case 4: {
                 exit(0);
             }
             default: