C語言連線兩個連結串列程式

建立兩個連結串列，並這兩連結串列連線起來成為一個連結串列的範例程式，將以下程式碼儲存到一個原始檔中：combine_linked_list.c， 如下所示 -

#include <stdio.h>
#include <stdlib.h>

struct node {
    int data;
    struct node *next;
};

struct node *even = NULL;
struct node *odd = NULL;
struct node *list = NULL;

//Create Linked List
void insert(int data) {
    // Allocate memory for new node;
    struct node *link = (struct node*) malloc(sizeof(struct node));
    struct node *current;

    link->data = data;
    link->next = NULL;

    if (data % 2 == 0) {
        if (even == NULL) {
            even = link;
            return;
        }
        else {
            current = even;

            while (current->next != NULL)
                current = current->next;

            // Insert link at the end of the list
            current->next = link;
        }
    }
    else {
        if (odd == NULL) {
            odd = link;
            return;
        }
        else {
            current = odd;

            while (current->next != NULL)
                current = current->next;

            // Insert link at the end of the list
            current->next = link;
        }
    }
}

void display(struct node *head) {
    struct node *ptr = head;

    printf("[head] =>");

    while (ptr != NULL) {
        printf(" %d =>", ptr->data);
        ptr = ptr->next;
    }

    printf(" [null]\n");
}

void combine() {
    struct node *link;

    list = even;
    link = list;

    while (link->next != NULL) {
        link = link->next;
    }

    link->next = odd;
}

int main() {
    int i;

    for (i = 1; i <= 10; i++)
        insert(i);

    printf("Even : ");
    display(even);

    printf("Odd  : ");
    display(odd);

    combine();

    printf("Combined List :\n");
    display(list);

    return 0;
}

執行上面程式，得到以下結果 -

Even : [head] => 2 => 4 => 6 => 8 => 10 => [null]
Odd  : [head] => 1 => 3 => 5 => 7 => 9 => [null]
Combined List :
[head] => 2 => 4 => 6 => 8 => 10 => 1 => 3 => 5 => 7 => 9 => [null]