Basics of Linked Lists in C

#include <stdio.h>
#include <stdlib.h>


struct node {
  int x;
  struct node *next;
};


int main()
{
    struct node *root;       
    struct node *conductor;  
    root = malloc(sizeof(struct node));  
    root->next = 0;   
    root->x = 12;
    conductor = root; 
    if ( conductor != 0 ) {
        while ( conductor->next != 0)
        {
            conductor = conductor->next;
        }
    }
    conductor->next = malloc( sizeof(struct node) );  
    conductor = conductor->next; 
    if ( conductor == 0 )
    {
        printf( "Out of memory" );
        return 0;
    }
    conductor->next = 0;         
    conductor->x = 42;
    return 0;
}