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

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

    if (!f)
        return 1;

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

    result=stat("test.bin",&st);

    if (result)
        printf("Error getting information!\n");
    else
        printf("%d\n",st.st_size);
    return 0;
}