Thread: Problem in Linked List

I have a "input.txt" :

Code:

5 //number of number follow
1 3 6 2 4

and I want to read them and create linked list for each element of sequence.
this is my code:

Code:

#include <stdio.h>
#define fi "input.txt"
typedef struct tagNode{
    int info;
    struct tagNode *pNext;
}Node;
typedef struct tagList{
    Node *pHead;
    Node *pTail;
}List;
int main(){
    FILE *f;
    List *nList;
    nList=malloc(sizeof(List));
    f=fopen(fi,"r");
    int n;
    fscanf(f,"%d",&n);
    int i;
    int c;
    fscanf(f,"%d",&c);
    nList->pHead->info=c;
    nList->pHead->pNext=nList->pTail;
    nList->pTail->pNext=NULL;
    Node *tmp;
    tmp=malloc(sizeof(Node));
    for(i=2;i<=n;i++){
        fscanf(f,"%d",&c);
        tmp->info=c;
        tmp->pNext=nList->pHead;
        nList->pHead=tmp;
    }
    fclose(f);
    return 0;
}

But I have got some problem at line

Code:

danhsach->pHead->info=c;

I have "segmentation fault".
So, what am I wrong here, please help me, please.

thanks

nList is malloced but not initialised. Therefore nList->pHead does not point at anything, so modifying nList->pHead->info overwrites a random area of memory.