#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <io.h>

int main()
{
    struct stat st;
    FILE *f=fopen("test.bin","wb");
    int nr1=5,nr2=7,result;
    size_t size;

    if (!f)
        return 1;

    fwrite(&nr1,sizeof(int),1,f);
    fwrite(&nr2,sizeof(int),1,f);

        fflush(f);

    size=filelength(fileno(f));

        fclose(f);
    printf("%d\n",size);
    return 0;
}