#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include <string.h>
#include <errno.h>

int main(int argc, char* argv[]) {
    char const* filename = "write_doubles_with_size.c.bin";
    FILE* file = fopen(filename, "r");
    if (file != NULL) {
        printf("Position is %ld\n", ftell(file));

        // read in the length - standard way size is determined
        int length;
        // when fread/fwrite is called, file position is incremented
        
        fread(&length, sizeof(length), 1, file);

        printf("Position is %ld\n", ftell(file));
        // read in numbers based on that length
        double* numbers = malloc(sizeof(*numbers) * length);
        fread(numbers, sizeof(*numbers), length, file);

        printf("Position is %ld\n", ftell(file));

        // print out the data
        for(int i = 0; i < length; i++) {
            printf("%f\n", numbers[i]);
        }

        // free memory
        free(numbers);
        fclose(file);
    } else {
        fprintf(stderr, "Failed to open %s:\n%s\n",
                filename, strerror(errno));
    }

    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */