单链表建立和输出的问题，求解决

Question

#include"stdio.h"
#include"stdlib.h"
#include"stdbool.h"

typedef int ElemType;
typedef struct LNode{
    ElemType data;
    struct LNode *next;
}LinkList;

void CreateListH(LinkList *L,ElemType a[],int n){
    LinkList *s;
    int i;
    L = (LinkList*)malloc(sizeof(LinkList));
    L->next = NULL;
    for(i = 0;i < n;i++){
        s = (LinkList*)malloc(sizeof(LinkList));
        s->data = a[i];
        s->next = L->next;
        L->next = s;
    }
}

void CreateListR(LinkList *L,ElemType a[],int n){
    LinkList *s,*r;
    int i;
    L = (LinkList*)malloc(sizeof(LinkList));
    r = L;
    // 分配新结点并用尾插法链接
    for(i = 0;i < n;i++){
        s = (LinkList*)malloc(sizeof(LinkList));
        s->data = a[i];
        r->next = s;
        r = s;
    }
    r->next = NULL;
}

void InitList(LinkList *L){
    L = (LinkList*)malloc(sizeof(LinkList));
    L->next = NULL;
}

void DestroyList(LinkList *L){
    // pre指向L，即头结点；p指向头结点的下一个结点，即首元结点
    LinkList *pre = L,*p = L->next;
    // 类似放鞭炮，前面响完后面响
    while (p != NULL){
        free(pre);
        pre = p;
        p = p->next;
    }
    free(pre);
}

bool EmptyList(LinkList *L){
    // TRUE：空 FALSE：非空
    return(L->next == NULL);
}

int ListLength(LinkList *L){
    int n = 0;
    LinkList *p = L;

    while(p->next != NULL){
        n++;
        p = p->next;
    }
    return (n);
}

void DisplayList(LinkList *L){
    LinkList *p = L->next;

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

int GetElem(LinkList *L,int i,ElemType e){
    int j = 0;
    LinkList *p = L;

    while (j<i && p!=NULL){
        j++;
        p = p->next;
    }
    if(p == NULL){
        return 0;
        // return false;
    }else{
        e = p->data;
        printf("Get %d's elem is:%d",i,e);
        return e;
        // return true;
    }
}

int main(){
    LinkList *L;
    int a[] = {1,3,5,7,9};
    CreateListH(L,a,3);
    DisplayList(L);
}

图片是断电调试提示的错误，请懂的兄弟帮我解答一下。

Answer 1

修改见注释，供参考：

#include"stdio.h"
#include"stdlib.h"
#include"stdbool.h"
typedef int ElemType;
typedef struct LNode{
    ElemType data;
    struct LNode *next;
}LinkList;
void CreateListH(LinkList **L,ElemType a[],int n){//修改
    LinkList *s;
    int i;
    (*L) = (LinkList*)malloc(sizeof(LinkList));
    (*L)->next = NULL;
    for(i = 0;i < n;i++){
        s = (LinkList*)malloc(sizeof(LinkList));
        s->data = a[i];
        s->next = (*L)->next;
        (*L)->next = s;
    }
}
void CreateListR(LinkList **L,ElemType a[],int n){//修改
    LinkList *s,*r;
    int i;
    (*L) = (LinkList*)malloc(sizeof(LinkList));
    r = (*L);
    // 分配新结点并用尾插法链接
    for(i = 0;i < n;i++){
        s = (LinkList*)malloc(sizeof(LinkList));
        s->data = a[i];
        r->next = s;
        r = s;
    }
    r->next = NULL;
}
void InitList(LinkList **L){           //修改
    (*L) = (LinkList*)malloc(sizeof(LinkList));
    (*L)->next = NULL;
}
void DestroyList(LinkList *L){
    // pre指向L，即头结点；p指向头结点的下一个结点，即首元结点
    LinkList *pre = L,*p = L->next;
    // 类似放鞭炮，前面响完后面响
    while (p != NULL){
        free(pre);
        pre = p;
        p = p->next;
    }
    free(pre);
}
bool EmptyList(LinkList *L){
    // TRUE：空 FALSE：非空
    return(L->next == NULL);
}
int ListLength(LinkList *L){
    int n = 0;
    LinkList *p = L;
    while(p->next != NULL){
        n++;
        p = p->next;
    }
    return (n);
}
void DisplayList(LinkList *L){
    LinkList *p = L->next;
    while (p != NULL){
        printf("%d ",p->data);
        p = p->next;
    }
    printf("\n");
}
int GetElem(LinkList *L,int i,ElemType e){
    int j = 0;
    LinkList *p = L;
    while (j<i && p!=NULL){
        j++;
        p = p->next;
    }
    if(p == NULL){
        return 0;
        // return false;
    }else{
        e = p->data;
        printf("Get %d's elem is:%d",i,e);
        return e;
        // return true;
    }
}
int main()
{
    LinkList *L,*R;
    int a[] = {1,3,5,7,9};
    CreateListH(&L,a,5); //CreateListH(L,a,3);
    DisplayList(L);
    printf("L-length:%d\n",ListLength(L));

    CreateListR(&R,a,3);
    DisplayList(R);
    printf("R-length:%d\n",ListLength(R));
    return 0;
}