copy array to linked list

why this program return null nodes?? thanks

Code:

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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);
}

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Quote:

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// Declare a "lastnode" pointer, initialized as NULL

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Well for starters, you never have actually done what this line asks you to.


Quzah.

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

Code:

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

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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