#include <stdio.h>
#include <stdlib.h>
int main (int argc, char *argv[])
{
    double a = 1.1;
    double b = 2.2;
    char * A = (char *) &a;
    char * B = (char *) &b;
    size_t s = abs (A - B);
    printf ("distanza: %i\n", s);
    return 0;
}

distanza: 8