sizeof(void)

#include <stdio.h>

int main(int argc, char *args[])
{
    int i;
    int *p = &i;
    void *v = &i;

    printf("p:  %p\n", p);
    printf("p+1:    %p\n", p + 1);
    printf("p+2:    %p\n\n", p + 2);

    printf("v:  %p\n", v);
    printf("v+1:    %p\n", v + 1);
    printf("v+2:    %p\n\n", v + 2);

    printf("sizeof(v):  %u\n", sizeof(v));
    printf("sizeof(*v): %u\n", sizeof(*v));

    return 0;
}

/*
p:  0xffe1e840
p+1:    0xffe1e844
p+2:    0xffe1e848

v:  0xffe1e840
v+1:    0xffe1e841
v+2:    0xffe1e842

sizeof(v):  8
sizeof(*v): 1
*/