刪除功能中的不需要的結果

Question

當我嘗試刪除列表的第2個節點時，我得到的第一個元素等於零，第2個節點沒有更改即時通訊使用代碼塊版本13.12 .......... .................................................. ..

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

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


struct node* Insert(struct node* head , int x) 
{ 
    struct node* temp = (struct node*)malloc(sizeof(struct node)); 
    if(head == NULL) { 

     temp->data = x; 
     temp->next = NULL; 
     head = temp; 
    return head; } 

temp->data = x; 
temp->next = NULL; 
struct node* temp1; 
temp1 = head; 
while(temp1->next != NULL) { 

    temp1= temp1->next; 
} 
temp1->next = temp; 
return head; 
} 

struct node* Delete (struct node* head, int a) 
{ 
struct node* temp1 = head; 
if (a == 1) 
    head = temp1->next; 
    free (temp1); 
    return head; 

for(int i = 0; i < a-2; i++) 
    temp1 = temp1->next; 

struct node* temp2; 
temp2 = temp1->next; 
temp1->next = temp2->next; 
free (temp2); 
return head; 

} 







void print(struct node* head) 
{ 

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

} 


int main() 
{ 
    struct node* root = NULL; 
    int a,c; 
    printf("How many numbers ? : \n"); 
    scanf("%d",&a); 
    for(int i = 0; i<a; i++) 
    { 
     printf("Enter a number:\n"); 
     scanf("%d",&c); 
     root = Insert(root, c); 
    } 
    Delete(root, 2); 
    print(root); 
return 0; 
} 

Answer 1

我在代碼中發現了兩個錯誤。首先是沒有功能Delete

if (a == 1) 
    head = temp1->next; 
    free (temp1); 
    return head; 

支撐一個代碼塊沒有括號，free (temp1); return head;總會執行。它應該是

if (a == 1) { 
    head = temp1->next; 
    free (temp1); 
    return head; 
} 

第二個錯誤是沒有返回值，從分配到Deleteroot。它應該是

root = Delete(root, 2); 

糾正這些後，它似乎運行正常。