CODEWITHSUNDEEP
cfilestructlinked-list
user3380850
user3380850

Reputation: 11

Importing file contents into a struct in C

This is a simple function I am making in order to learn how to copy data from files into structs. 

#include <stdio.h>
#include <stdlib.h>
#define FILENAME "studentlist.txt"

struct node {
    char *name[20];
    int age;
    struct node *next;
};

typedef struct node Node;

int main(){

    Node *p,*head = malloc(sizeof(Node));
    Node **listPtr;
    *listPtr = head;
    p = head;
    int num;

    FILE *students;
    if ((students = fopen(FILENAME,"r")) == NULL)
            printf("Error: Cant open file\n");
    else
    {
            num = fscanf("%i", &num);
            int i = 0;
            for (i = 0; i <= num; i++){
                    fscanf(students,"%s %i", p->name, p->age);
                    p = p->next;
                    p = malloc(sizeof(Node));
                    }

return 0;
}

The errors I am getting are related to the fscanf function. I am also getting

 expected 'struct FILE * __restrict__' but argument is of type 'char *'

What am I doing wrong?

Upvotes: 0

Views: 1269

Answers (2)

clcto
clcto

Reputation: 9648

You just forgot the FILE* in the line. 

num = fscanf("%i", &num );

That should be

num = fscanf( students, "%i", &num );

You should read the whole error. It tells you which line and possibly the character that is giving you an issue. They tell you the problem, which is 90% of solving it.

Upvotes: 2

ajay
ajay

Reputation: 9680

The signature of the standard library function fscanf is

int fscanf(FILE *stream, const char *format, ...);

Therefore, the following statement is wrong - 

num = fscanf("%i", &num);

The format string literal "%i" evaluates to a pointer to its first element, which is of type char *. However, fscanf expects the first argument of type FILE *. This explains the error statement. Replace this line with - 

num = fscanf(students, "%i", &num);

Upvotes: 1

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