如何使用方法的结构参数分配给 C 中的另一个结构？

Question

I am trying to insert values from the binary search tree to linkedlist.

• insertToLinkedList, I am using this method. But there is a problem with assigning.
• struct node
• struct nodeForLinkedList

struct node
{// Here node struct for leafs of the Tree
   
    char word[STRING_LEN]; //words
    struct node *left;
    struct node *right;
   
    
};
struct nodeForLinkedList
{
    
    char word[STRING_LEN]; //words
    struct node *left;
    struct node *right;
    struct node *next;
    
}
void insertToLinkedList(nodeForLinkedList *nodeL,char *data){
    struct nodeForLinkedList* new_node = (struct nodeForLinkedList*)malloc(sizeof(struct nodeForLinkedList)); 
    
     strcpy(new_node->word, data);                                       // To copy the elements of data to new node's word
    
    new_node->next = *nodeL; // Error occurs here.**(1)**
    *nodeL = new_node;// and here**(2)**


} 

Errors:

no suitable conversion function from "nodeForLinkedList" to "node *" existsC/C++(413) (1)

no operator "=" matches these operands -- operand types are: nodeForLinkedList = nodeForLinkedList (2)

Answer 1

You need to change the declaration of nodeL to be a pointer to a pointer, so that you can update the caller's pointer variable.

void insertToLinkedList(nodeForLinkedList **nodeL,char *data){
    struct nodeForLinkedList* new_node = (struct nodeForLinkedList*)malloc(sizeof(struct nodeForLinkedList)); 
    
    strcpy(new_node->word, data);                                       // To copy the elements of data to new node's word
    
    new_node->next = *nodeL; // Error occurs here.**(1)**
    *nodeL = new_node;// and here**(2)**
}

And when you call the function, it should be

insertToLinkedList(&listVariable, stringVariable);

See Changing address contained by pointer using function for more information.

Answer 2

I am trying to insert values from the binary search tree to linkedlist.

• insertToLinkedList, I am using this method. But there is a problem with assigning.
• struct node
• struct nodeForLinkedList

struct node
{// Here node struct for leafs of the Tree
   
    char word[STRING_LEN]; //words
    struct node *left;
    struct node *right;
   
    
};
struct nodeForLinkedList
{
    
    char word[STRING_LEN]; //words
    struct node *left;
    struct node *right;
    struct node *next;
    
}
void insertToLinkedList(nodeForLinkedList *nodeL,char *data){
    struct nodeForLinkedList* new_node = (struct nodeForLinkedList*)malloc(sizeof(struct nodeForLinkedList)); 
    
     strcpy(new_node->word, data);                                       // To copy the elements of data to new node's word
    
    new_node->next = *nodeL; // Error occurs here.**(1)**
    *nodeL = new_node;// and here**(2)**


} 

Errors:

no suitable conversion function from "nodeForLinkedList" to "node *" existsC/C++(413) (1)

no operator "=" matches these operands -- operand types are: nodeForLinkedList = nodeForLinkedList (2)