// truth.c -- what values are true?
#include <stdio.h>

int main(void)
{
	int n = 3;

	while (n)
	{
		printf("%2d is true\n", n--);
	}
	printf("%2d is false\n", n);
	n = -3;
	while (n)
	{
		printf("%2d is true\n", n++);
	}
	printf("%2d is false\n", n);
	return 0;
}