#include <stdio.h>
#include <ctype.h>

/* Convert a string to lower case. */

stolower(s)
char *s;
{
	while (*s) {
		*s= tolower(*s);
		++s;
	}
}
/* Convert a string to upper case. */

stoupper(s)
char *s;
{
	while (*s) {
		*s= toupper(*s);
		++s;
	}
}