#include <stdio.h>

int main() {
    FILE *f = fopen("data.bin", "wb");

    int num = 123;
    fwrite(&num, sizeof(int), 1, f);

    fclose(f);

    // Read back
    f = fopen("data.bin", "rb");

    int x;
    fread(&x, sizeof(int), 1, f);

    fclose(f);

    printf("Read from binary file: %d\n", x);

    return 0;
}