利用鏈表計算兩個數字之和

#include <stdio.h>
typedef struct {
    int data;
    struct Node* next;
}Node;

Node* CreateNode(int value) {
    Node* temp = (Node*)malloc(sizeof(Node));
    temp->data=value;
    temp->next=NULL;
    return temp;
}

Node* InsertNodeFromHead(Node* head, int value){
    Node* p=CreateNode(value);
    if(head==NULL) {
        head=p;
    } else {
        p->next=head;
        head=p;
    }
    return head;
}

void PrintLinkedList(Node* head) {
    if(head==NULL) {
        printf("Current linked list is empty.");
    }
    else {
        Node* p=head;
        while(p) {
            printf(" %d =>", p->data);
            p=p->next;
        }
    }
    printf(" NULL\n");
}

Node* AddSumFromLinkedList(Node* head1, Node* head2) {     Node* head3=NULL, *p1=head1, *p2=head2;     int addone = 0, sum = 0;     while(p1 || p2) {         sum = (p1==NULL?0:p1->data) + (p2==NULL?0:p2->data);         head3=InsertNodeFromHead(head3, sum%10+addone);         addone = 0;         addone = sum>=10?1:0;         if(p1) p1=p1->next;         if(p2) p2=p2->next;     }     if(addone==1) {         head3=InsertNodeFromHead(head3, addone);     }     return head3; } int main() {     Node* head1=NULL;     Node* head2=NULL;     Node* head3=NULL;     head1=InsertNodeFromHead(head1,8);     head1=InsertNodeFromHead(head1,8);     head1=InsertNodeFromHead(head1,8);     PrintLinkedList(head1);         head2=InsertNodeFromHead(head2,8);     head2=InsertNodeFromHead(head2,8);     head2=InsertNodeFromHead(head2,8);     PrintLinkedList(head2);         head3=AddSumFromLinkedList(head1, head2);     PrintLinkedList(head3);     return 0; }