C语言链表基本操作（头插法及其逆置）

#include <stdio.h>
#include <malloc.h>

typedef struct Node
{
    char data;
    struct Node *next;
}SN;

SN * create(int n)
{
    int i;
    SN *h,*p;
    h = NULL;
    for(i = 0; i<n; i++)
    {
        p=(SN*)malloc(sizeof(SN));
        printf("请输入第%d个字符：",i+1);
        p->data = getchar();
        fflush(stdin);
        p->next = h;
        h=p;
    }
    return h;
}

SN * def(SN * h)
{ 
    SN * n1, *n2;
    n1 = h;
    n2 = NULL;
    while(n1 != NULL)
    {
        SN *temp;
        temp = n1;
        n1 = n1->next;
        temp->next = n2;
        n2 = temp;
    }
    h = n2;
    return h;
}
void visit(SN * h)
{ 
    while(h != NULL)
    {
        printf("%c", h->data);
        h = h->next;
    }
    printf("\n");
}

void freelist(SN *h)
{
    SN *temp = h;
    SN *del;
    while (temp != NULL) {
        del = temp;
        temp = temp->next;
        free(del);
    }
}

int main() 
{
    int n;
    SN *h;
    printf("请输入字符个数：\n");
    scanf("%d", &n);
    fflush(stdin);
    h = create(n);
    printf("链表创建成功，对其遍历\n");
    visit(h);
    printf("链表逆置成功，对其遍历\n");
    h = def(h);
    visit(h);
    freelist(h);
    return 0;
}