مشکل در تعریف لینک لیست

سلام دوستان . من میخوام یک لینک لیست ساده درست کنم . برنامه زیر رو نوشتم ولی ارور میده . مشکل از چیه ؟ ممنون
#include "stdafx.h"
struct node
{
int data;
struct node *next;
}

int _tmain(int argc, _TCHAR* argv[])
{
node *tmp1 = new node;
node *tmp2 = new node;


tmp1->data = 5;
tmp1->next = tmp2->next;
tmp2->data = 6;
tmp2->next = NULL;

return 0;
}

باید اینطوری تعریف کنید و استفاده کنید

#include <stdio.h>

#include <stdlib.h>







typedef struct node {

  int x;

  struct node *next;

}lnode;



/* This won't change, or we would lose the list in memory */

lnode* root;



int pushBack(lnode* conductor , const int value){



    if(root == 0){

        root = malloc( sizeof(lnode) );

        root->next = NULL;

        root->x = 32;

    }



    conductor = root;

    if ( conductor != 0 ) {

        while ( conductor->next != 0){

            conductor = conductor->next;

        }

    }



    /* Creates a node at the end of the list */

    conductor->next = malloc( sizeof(lnode) );



    conductor = conductor->next;



    if ( conductor == 0 ){

        printf( "Out of memory" );

        return 0;

    }

    /* initialize the new memory */

    conductor->next = NULL;

    conductor->x = value;

    return 1;

}



void showList(){

    if ( root != 0 ) { /* Makes sure there is a place to start */

        while ( root->next != 0 ) {

            printf( "%d\n", root->x );

            root = root->next;

        }

            printf( "%d\n", root->x );

    }

}



int main()

{



    /* This will point to each node as it traverses the list */

    lnode *conductor = malloc( sizeof(lnode) );

    lnode *conductor2 = malloc( sizeof(lnode) );

    lnode *conductor3 = malloc( sizeof(lnode) );

    lnode *conductor4 = malloc( sizeof(lnode) );



    pushBack(conductor  , 42);

    pushBack(conductor2 , 52);

    pushBack(conductor3 , 62);

    pushBack(conductor4 , 72);



    showList();



    free(root);



    return 0;

}