Thread: copy array to linked list

why this program return null nodes?? thanks

Code:

void CopyStudRecordsFromArrayToLinkedList(StudNodePtr *ppList, STUDENT A[],int total)
{	//Pseudocode:
	//   Declare a "lastnode" pointer, initialized as NULL
	//   For each record in the array
	//      Create a new node and setup the node content
	//      If this is the first node, update *ppList
	//      Otherwise append it to the end of the linked list (ie. after "lastnode")
	//      Update "lastnode" to point to the new node 

	//Your task: Finish this function
	StudNodePtr p, pLast, pRtn=NULL;
	int i;
	for (i=0;i<total;i++)
	{	if (p==NULL)
		{	printf("Cannot create new node\n");
			exit(-1);
		}

		p = (StudNodePtr)malloc(total*sizeof(struct StudNode));
		p->data=A[i];
		p->next=NULL;
		if (pRtn==NULL)
		{	pRtn = p;
			pLast = p;
		}
		else
		{	pLast->next=p;
			pLast = p;
		}
	}

void main()
{	
	#define TOTAL 10

	STUDENT A[TOTAL];
	int i;
	StudNodePtr pList=NULL;
	
	//Setup the data
	for (i=0;i<TOTAL;i++)
	{	A[i].StudentID=50000000+i;
		A[i].ProgramCode=4000+i%3;
	}

		CopyStudRecordsFromArrayToLinkedList(&pList, A, TOTAL);
}

After I declare pLast = NULL, it still return 0 nodes, thanks

Code:

p = (StudNodePtr)malloc(total*sizeof(struct StudNode));

well, what is this? u are expected to create a node of size struct node not 10 * struct studnode. where u are just wasting a hell lot of memory. and with your programe the links are not proprer. and few pointer of type studNote which are not pointing any where.

its better u go through your teacher material or any good book which guides u from basic of linked list

ssharish2005