How to read a csv file in C?

Question

I am trying to read a CSV file in C. The CSV file contains one column and 1024 rows. The CSV file contains only decimal numbers. So far I have this code, but the numbers from the output and the CSV file do not match. The CSV file is called file.csv

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int main(void)
{
    FILE *stream;
    errno_t err;

    err = fopen_s(&stream, "file.csv", "r");
    if (stream == NULL) {
        printf("\n file opening failed ");
        return -1;
    }

    double values[1024];
    int count;
    for (count = 0; count < 1024; count++) {

        double u = fscanf_s(stream, "%d", &values[count]);
        printf("%d\n", u);
    }

return(0);

}

Answer 1

Scan into and print double objects using %lg, not %d.

The return type of fscanf_s is an int, not a double. Test it to see if the desired number of items were assigned (one, in your case), and, if not, print an error message and exit the program.