#include <stdio.h>

static void __attribute__((__noinline__))
hexdump(const char *name, const volatile void *buf, size_t len)
{
	const volatile unsigned char *p = buf;
	size_t n = len;

	fprintf(stderr, "name@%p, buf@%p, len=%zu\n", name, buf, len);

	printf("%s: ", name);
	while (n --> 0)
		printf("%0hhx", *p++);
	printf("\n");
}

int
main(void)
{
	volatile int c = '2';
	volatile int di = c - '0';
	hexdump("di", &di, sizeof di);
	//volatile long double dld = di;
	//hexdump("dld", &dld, sizeof dld);
	//volatile double dd = di;
	//hexdump("dd", &dd, sizeof dd);
	//volatile long double ddld = dd;
	//hexdump("ddld", &ddld, sizeof ddld);
	//printf("i=%d dld=%.17Lg=%La dd=%.17g=%a ddld=%.17Lg=%La\n", di, dld, dld, dd, dd, ddld, ddld);
	return 0;
}