c - Inserting New Node -

here function of program i'm writing more familiar nodes.

it creates new node , inserts information code field , points existing first node. assigns head newly created node;

unfortunately it's giving me incompatible types new_node->location = code;

typedef char librarycode[4];  typedef struct node {     librarycode location;     struct node *next; } node;  void insertfirstnode(librarycode code, node **listptr) {     node *new_node;     new_node=malloc(sizeof(node));     new_node->location = code;     new_node->next = *listptr;     *listptr = new_node; } 

librarycode typdefed char [4]. can't assign 1 array another, you'll need memcpy or strcpy data 1 array other.

a simpler example of what's going on:

void foo() {    char a[4];    char b[4];    = b; } 

compiling gives error:

in function ‘foo’: error: incompatible types when assigning type ‘char[4]’ type ‘char *’    = b;      ^ 

you can see you're trying assign pointer array, incompatible types.

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the typedef char librarycode[4]; not idea anyway. if you're going keep fixed-size buffer string in node, ditch typedef it's clear you're doing. also, never pass char [4] by value function. strings, pass const char*.