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

typedef struct {
    int x;
    int y;
} Point;

int main(int argc, char* argv[]) {
    char const* filename = __FILE__ ".bin";

    // write point to file
    FILE* output_file = fopen(filename, "w");

    Point p = { .x = 7, .y = 8 };
    printf("Position is %ld\n", ftell(output_file));
    fwrite(&p, sizeof(p), 1, output_file);
    printf("Position is %ld\n", ftell(output_file));
    fclose(output_file);



    // read point from file
    FILE* input_file = fopen(filename, "r");

    Point input_point;
    printf("Position is %ld\n", ftell(input_file));
    fread(&input_point, sizeof(input_point), 1, input_file);
    printf("Position is %ld\n", ftell(input_file));

    printf("(x, y) == (%d, %d)\n", input_point.x, input_point.y);

    fclose(input_file);


    return EXIT_SUCCESS;
}
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