compiler errors

Newworld · #1 27-Oct-2004, 22:51

having a lot of trouble with my code... so I'll start with my insert function.

in my insert function:
project3.c:22: `node' undeclared (first use in this function)
project3.c:22: (Each undeclared identifier is reported only once
project3.c:22: for each function it appears in.)
project3.c:22: parse error before ' ) ' token
project3.c:32: warning: assignment makes pointer from integer without a cast
project3.c:37: warning: assignment makes pointer from integer without a cast

here is my code:

CPP / C++ / C Code:

#include <stdio.h>
#include "rndm.h"

struct node
{
    int data;
    unsigned long link;
};

struct node *head, *tail;

/*Function to insert node into list*/
void insert(int num)
{
	struct node *tmp, *next, *prv, *cur;
	tmp= (node *) malloc (sizeof(struct node));
    prv=0;
    cur=head;
    next=head;
    if(head==NULL)
	{
	    head=tmp;
	    tmp->link=0;
	    tail->link=(unsigned long)tmp;
    }else{
        next= cur->link^(unsigned long)prv;
        while(tmp->data > cur->data && cur->link^next->link !=0)
        {
                prv= cur;
                cur= next;
                next= cur->link^(unsigned long)prv;
		}
		if(cur->link^next->link ==0)
		{
		        tail=tmp;
        }else{
        }
        prv->link ^= (unsigned long)cur^(unsigned long)tmp;
		cur->link ^=(unsigned long)prv^(unsigned long)tmp;
		tmp->link = (unsigned long)prv^(unsigned long)cur;
	}
    
}

/*Function To print out data contents of each node*/
void list()
{
	struct node *tmp, *cur, *next, *prv;
    printf("%d",&head->data);
	prv=0;
	cur=head;
	next=(unsigned long)prv^(unsigned long)cur;
	while(next->link^cur->link!=0)
	{
		printf("%d ",&cur->data);
		prv=cur;
		cur=next;
		next=cur->link^(unsigned long)prv;
	}



}

int main{
    
	init_seed(123456);
	set_range(1,9999);
	int x=0;
	int i;
    head=NULL;
	tail=NULL;
	for(i=0;i<100;i++)
	{
	    x=rndm();
	    insert(x);
    }
	list();




}

dsmith · #2 28-Oct-2004, 08:07

Hello Newworld. I can help you a bit with your comile errors, but not your logic. I am not sure why the heavy usage of the bitwise xor operator in this. If you get a chance, I would love to hear what this is doing....

The error at line 22, you need to include struct:

CPP / C++ / C Code:

tmp= (struct node *) malloc (sizeof(struct node));

The warnings need to be typecast. You are assigning an unsigned long but it is looking for a struct node *. They are the same thing, but it is best to not have any warnings. It also forces you to explicitly think about typecasting. It is not something to do lightly and should only be done when you are sure of what you are doing:

CPP / C++ / C Code:

next= (struct node *) (cur->link^(unsigned long)prv);

There are other errors as well that you should unearth now... Since I am not sure exactly what you want to do, I will only point out the ones that you asked about.

Good luck.

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