/* Exercise 2.10 from "The C programming language" book by K&R */

#include <stdio.h>

/* convert c to low register; only ASCII */
int lower(int c)
{
	return (c >= 'A' && c <= 'Z') ? c + 'a' - 'A': c;
}

int main(void)
{
	printf("%c", lower('A'));
	return 0;
}