#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <stdbool.h>
#include <fcntl.h>
#include <unistd.h>
#include <inttypes.h>


#define ARRAY_SIZE 10


int main() {
    srand(time(NULL));
    int file = open(
        "file",
        O_RDWR | O_CREAT | O_TRUNC,
        S_IRUSR | S_IWUSR
    );
    double array[ARRAY_SIZE];
    for (int i = 0; i < ARRAY_SIZE; ++i) {
        array[i] = i;
    }
    for (int i = 0; i < ARRAY_SIZE; ++i) {
        printf("%d: %lf\n", i, array[i]);
    }
    int length = ARRAY_SIZE * sizeof(double);
    char* data = (char*)array;
    while (length > 0) {
        ssize_t wrote = write(file, data, length);
        length -= wrote;
        data += wrote;
    }
    close(file);
    return 0;
}