/*
 * How far is p + 1? Given; do not edit it. Predict first, then run it.
 * README.md says how to build and run it.
 */
#include <stdio.h>

int main(void)
{
    char letters[4] = {'a', 'b', 'c', 'd'};
    int counts[4] = {10, 20, 30, 40};
    double weights[4] = {0.5, 1.5, 2.5, 3.5};

    char *pc = letters;
    int *pi = counts;
    double *pd = weights;

    /* A char is one byte, so the gap between two char * addresses is in bytes. */
    printf("char:   p = %p   p + 1 = %p   bytes apart: %td\n",
           (void *)pc, (void *)(pc + 1), (char *)(pc + 1) - (char *)pc);
    printf("int:    p = %p   p + 1 = %p   bytes apart: %td\n",
           (void *)pi, (void *)(pi + 1), (char *)(pi + 1) - (char *)pi);
    printf("double: p = %p   p + 1 = %p   bytes apart: %td\n",
           (void *)pd, (void *)(pd + 1), (char *)(pd + 1) - (char *)pd);

    /* The same moves, read back through the pointers. */
    printf("*(pc + 1) = %c   *(pi + 1) = %d   *(pd + 1) = %.1f\n",
           *(pc + 1), *(pi + 1), *(pd + 1));
    printf("(pi + 3) - pi = %td\n", (pi + 3) - pi);
    return 0;
}