BEGIN {

	x = "A"

	printf("%-39s\n", substr(x,1,39))

	print substr("abcdef", 0, 2)

	print substr("abcdef", 2.3, 2)

	print substr("abcdef", -1, 2)

	print substr("abcdef", 1, 0)

	print substr("abcdef", 1, -3)

	print substr("abcdef", 1, 2.3)

	print substr("", 1, 2)

	print substr("abcdef", 5, 5)

	print substr("abcdef", 7, 2)

	exit (0)

}