Thread: Link list function call

well with the fixed corrections im only getting one error at the return saying i cannot convert from an info_node* to int..

Code:

int build_list(struct info_node* pnode)
{

	FILE* infile ;
	struct info_node* link1 ;
	struct info_node* top ;
	int result ;

		infile = fopen("p3purge_data.txt", "r") ;

		link1 = (info_node *)malloc(sizeof(info_node) ) ;
		fscanf( infile, "%s%s%d%f", link1->fname , link1->lname, &link1->rank, &link1->score ) ;

		top = link1 ;
		
		fclose(infile);
	return(top) ;
}

That is true. You can't. So don't.

Code:

struct info_node * build_list(struct info_node* pnode)

so using that case how would i call the function

The same way... you would need casts for your current implementation. And casts be damned, your current implementation is just plain wrong.

so the call would be something similiar to:

Code:

result = build_list(top)    ??

Code:

struct info_node * build_list(struct info_node* pnode)
{

	FILE* infile ;
	
	struct info_node* top;
	int result = 0;

		infile = fopen("p3purge_data.txt", "r") ;
	
		pnode = (info_node *)malloc(sizeof(info_node) ) ;
		fscanf( infile, "%s%s%d%f", pnode->fname , pnode->lname, &pnode->rank, &pnode->score ) ;

		top = pnode ;
		fclose(infile);
	return(top) ;
}

Why do you want result to be an int? Why would it ever be an int anyway? You want a pointer to an object not an integer. You could cast, but again, why?

kk so i have it to build my list, quick question(if i do all the same things to build a separate list can i return two values under two different names(ie: return(top, top2)

You can call the function twice to build two different lists, yes. You can't return two different lists from the same function call.

but i could pass the two different infiles in..got it. but say i wanted to use string compare to remove copied names out of one list that are in the other..is there any special approach to that or can i just use string compare in main somehow remove nodes that are copied?