C language structure pointer definition problem help

wsdymg

C language structure pointer definition problem help [Copy link]

Recently, I was debugging an Aurix TC275 controller. I defined a linked list in the program. The program is as follows: typedef struct { char *name; NODEPTR nextone; } *NODEPTR; During the compilation process, the compiler reported an error, prompting "Error, cannot use typedef type before defining it". Can't structure elements in C language contain pointers to themselves?

lcofjp

typedef struct NODE { char *name; NODE *nextone; } *NODEPTR; You can only define it this way, define it first and then use it

huo_hu

Just change it to address type, and use (NODE *)

damiaa

Typedef is a keyword in C language, which is used to define a new name for a data type. The data types here include internal data types (int, char, etc.) and user-defined data types (struct, etc.). There are generally two purposes for using typedef in programming. One is to give the variable a new name that is easy to remember and has a clear meaning, and the other is to simplify some more complex type declarations. typedef struct { char *name; NODEPTR nextone; } NODE; Here, a new name is declared for this structure, which is easy to use later. NODE NODES, *NODESPTR; Define a structure of type NODE and a pointer. NODESPTR = &NODES; Assign the address of the structure to the pointer for easy operation.

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