C编程中的链接列表插入问题

Question

我是C编程新手。我编写了以下程序，在开头和结尾插入链接的元素。但是它不起作用。请帮我。似乎scanf无法正常工作。 我是C语言编程的新手。我编写了以下程序，在开头和结尾插入链接的元素。但是它不起作用。请帮我。似乎scanf无法正常工作。

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



typedef char DATA ;
struct node
{
DATA d ;
struct node * next ;
};



void print(struct node* pr );
struct node* insertBeg(struct node* head, char c);
void insertEnd(struct node* head, char c);



 main()

{
      DATA c1;
    struct node* head=(struct node*) malloc(sizeof(struct node));

head->next=NULL;

    printf("please enter first element\n");
scanf( &c1);
head->d=c1;
    char begenninglement;
    char endelement;

   printf("enter element to insert at the beggning \n");
   scanf(&begenninglement);
   insertBeg(head, begenninglement);
   print(head);

    printf("enter element to insert at the end \n");
   scanf( &endelement);

    insertEnd(head, endelement);
    print(head);



return 0;

}

struct node* insertBeg(struct node* head, char c)
{
    struct node* temp;
    temp=(struct node*)malloc(sizeof(struct node));
    temp->d=c;
    temp->next=head;
    head=temp;
    return head;
}

void insertEnd(struct node* head, char c)
{
   struct node* temp, *p;

   temp=(struct node*)malloc(sizeof(struct node));
    temp->d=c;
    p=head;
    while(p!=NULL)
    {
        p=p->next;
    }
    p->next=temp;
    temp->next=NULL;


}


void print(struct node *pr) {
    struct node *current_node = pr;
    while ( current_node != NULL) {
        printf("%c", current_node->d);
        current_node = current_node->next;
    }
}