type mismatch in re-declaration error in doubly linked list using project file in c

Question

I converted my code to a project file as per requirement.

after converting it I got some redeclaration errors:

type mismatch in redeclaration of 'n'

declaration syntax error for n* create_node(int);

UPDATED CODE

new error upon running:

new, first and last are undefined in some of my included files.

CIRC.H file:

#ifndef CIRC_H
#define CIRC_H

struct node{
    int val;
    struct node *next;
    struct node *prev;    
};

typedef struct node n;

struct node * create_node(int);
int add_node();
int insert_at_first();
int insert_at_end();
int insert_at_position();
int delete_node_position();
int sort_list();
int update();
int search();
int display_from_beg();
int display_in_rev();



#endif

CIRC.C File:

    #include "CIRC.H"
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>

struct node *new, *ptr, *prev; 
struct node *first = NULL, *last = NULL;
int number = 0;


void main(){

    int ch;
    clrscr();

    while (1){
       //textt
    }
}

struct node * create_node(int info){
    number++;
     new = (struct node *)malloc(sizeof(n));
    new->val = info;
    new->next = NULL;
    new->prev = NULL;
    return new;
}

What am I missing here?

Answer 1

I guess instead of this :

struct n *new,

You meant

struct node *new,

And here instead of

n* create_node(int);

=> struct node * create_node(int);