Display memory block via Hexadecimal.

hexout.c

#include <stdio.h>

/**
 * Display memory block via Hexadecimal.
 * From lower to higher address.
 **/
 
void hexOut(unsigned char c) {
	printf("%x", c & 0xF);
	printf("%x", (c >> 4) & 0xF);
}

void displayInHex(void * block, int size) {
	unsigned char *tmp = (unsigned char *) block;
	int i;
	for (i = 0; i < size; i++) {
		hexOut(*(tmp + i));
		if (i % 2 == 1)
			printf(" ");
	}
	printf("\n");
}

struct demo {
	int a;
	long b;
	double c;
};

int main() {
	double a = 0.3;
	struct demo d = { 1, 2, 0.3 };

	// double 0.3 in hex is 0x3fd3333333333333
	displayInHex(&a, sizeof(a)); //3333 3333 3333 3df3
	displayInHex(&d, sizeof(d)); //1000 0000 0000 0000 2000 0000 0000 0000 3333 3333 3333 3df3
	return 0;
}