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DS/C/Lab/Week8/DLLConcat.c

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+//Write a program to concatenate two doubly linked lists X1 and X2. After
+// concatenation X1 is a pointer to first node of the resulting lists.
+
+#include <stdio.h>
+#include <stdlib.h>
+
+typedef struct node {
+    int data;
+    struct node *llink;
+    struct node *rlink;
+} *node_pointer;
+
+void concatenate(node_pointer *X1, node_pointer *X2) {
+    node_pointer temp;
+    if (*X1 == NULL) {
+        *X1 = *X2;
+    } else if (*X2 != NULL) {
+        temp = *X1;
+        while (temp->rlink != NULL)
+            temp = temp->rlink;
+        temp->rlink = *X2;
+        (*X2)->llink = temp;
+    }
+}
+
+node_pointer create_node(int data) {
+    node_pointer new_node = (node_pointer)malloc(sizeof(struct node));
+    new_node->data = data;
+    new_node->llink = NULL;
+    new_node->rlink = NULL;
+    return new_node;
+}
+
+void insert_end(node_pointer *head, int data) {
+    node_pointer new_node = create_node(data);
+    if (*head == NULL) {
+        *head = new_node;
+    } else {
+        node_pointer temp = *head;
+        while (temp->rlink != NULL)
+            temp = temp->rlink;
+        temp->rlink = new_node;
+        new_node->llink = temp;
+    }
+}
+
+void print_list(node_pointer head) {
+    node_pointer temp = head;
+    while (temp != NULL) {
+        printf("%d ", temp->data);
+        temp = temp->rlink;
+    }
+    printf("\n");
+}
+
+int main() {
+    node_pointer X1 = NULL, X2 = NULL;
+
+    insert_end(&X1, 1);
+    insert_end(&X1, 2);
+    insert_end(&X1, 3);
+
+    insert_end(&X2, 4);
+    insert_end(&X2, 5);
+
+    printf("X1: ");
+    print_list(X1);
+    printf("X2: ");
+    print_list(X2);
+
+    concatenate(&X1, &X2);
+
+    printf("After concatenation:\n");
+    printf("X1: ");
+    print_list(X1);
+
+    return 0;
+}