Char to reverse binary

The following C code can be used, to get a reverse binary representation of a char character:

#include <stdio.h>
#include <string.h>

/*
 * This function returns a string in reverse binary order.
 */

void
char_to_bin_reverse(char *c)
{
	int i, bin;
	char ch;

	while ((ch = *c++) != NULL) {

		printf("ch's char value: %c\n", ch);
		printf("ch's decimal value: %d\n", ch);

		printf("ch's binary value: ");
		for (i = 0; i < 8; i++) {
			bin = ((ch >> i) & 1) ? 1 : 0;
			printf("%d", bin);
		}
		printf("\n");
	} /* while */
}

int
main()
{
	char *msg = "Hello, world!";

	printf("char to binary reverse:\n");
	char_to_bin_reverse(msg);

	printf("\n");
	return(0);
}