#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>	/* for tolower: KR pp. 166, 248-249; King p. 528 */

#define N 256	/* maximum word length */
void lower(char *p);

int main()
{
	char a[N];

	printf("Please type a word and press RETURN.\n");
	scanf("%s", a);
	lower(a);
	printf("The word in all lowercase is %s.\n", a);

	return EXIT_SUCCESS;
}

/* Change the string to all lowercase. */

#if 0
void lower(char *string)
{
	char *p;

	for (p = string; *p != '\0'; ++p) {
		*p = tolower(*p);
	}
}
#endif

void lower(char *p)
{
	if (*p != '\0') {
		*p = tolower(*p);
		lower(p + 1);
	}
}