C separate string with commas in vectors

Question

I want to separate each line of a file into 2 vectors: v[i]. date and v[i].value. However, when I run the code no value I print is correct, and the outputs are random values. There’s something I should change?

Input
02/20/18,11403.7
02/19/18,11225.3
02/18/18,10551.8
02/17/18,11112.7
02/16/18,10233.9

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>


typedef struct
{
    char *date;
    long int *value;
}vetor;

int main(int argc,char **argv)
{
    FILE *btc;

    if((btc=fopen("BTC.csv", "r")) == NULL  )
    {
        printf("not found btc\n");
        exit(-1);
    }


    long int a=0;

    char linha[256];
    char *token = NULL;

    while (fgets(linha, sizeof(linha), btc) != 0)
    { 
            a++;
    }

    vetor *v;

    v=(vetor*)malloc(a*sizeof(vetor));

    char linha2[256];

    while (fgets(linha2, sizeof(linha2), btc) != 0)
    {
        for(int i=0;i<a;i++)
        {
            fscanf(btc,"%[^,]s",v[i].date);
            fscanf(btc,"%d[^,]",&v[i].value);
            fseek(btc, +1, SEEK_CUR);
        }
    }

    fclose(btc);    
    return 0;
}

Answer 1

In its vector structure you define two pointers: a char pointer (date) and another pointer to long int (value). To effectively store the read values you need to allocate the required space and have each of these pointers point to the respective memory space.