djswitch
static struct djswitch *dftswitch =
switches + sizeof(switches) / sizeof(struct djswitch) - 2;
struct djswitch *p, *q; /* to search user defined switch date */
q = switches + sizeof(switches) / sizeof(struct djswitch);
sizeof(switches) / sizeof(struct djswitch);
struct djswitch *p;
n = sizeof(switches) / sizeof(struct djswitch);