p56.c

#include <stdio.h>

typedef unsigned char *byte_pointer;

void show_bytes(byte_pointer start, size_t len)
{
	size_t i;
	for (i = 0; i < len; i++)
		printf(" %.2x", start[i]);
	printf("\n");
}

void show_int(int x)
{
	show_bytes((byte_pointer) &x, sizeof(int));
}

void show_float(float x)
{
	show_bytes((byte_pointer) &x, sizeof(float));
}

void show_pointer(void *x)
{
	show_bytes((byte_pointer) &x, sizeof(void *));
}

void test_show_bytes(int val)
{
	int ival = val;
	float fval = (float) ival;
	int *pval = &ival;
	show_int(ival);
	show_float(fval);
	show_pointer(pval);
}

int main(void)
{
	test_show_bytes(12345);
	printf("\n");
	test_show_bytes(11);
	return 0;
}