#! /bin/sh

: 'This file is in the public domain, so clarified as of'

: '2006-07-17 by Arthur David Olson.'

: '@(#)yearistype.sh	8.2'

case $#-$1 in

	2-|2-0*|2-*[!0-9]*)

		echo "$0: wild year - $1" >&2

		exit 1 ;;

esac

case $#-$2 in

	2-even)

		case $1 in

			*[24680])			exit 0 ;;

			*)				exit 1 ;;

		esac ;;

	2-nonpres|2-nonuspres)

		case $1 in

			*[02468][048]|*[13579][26])	exit 1 ;;

			*)				exit 0 ;;

		esac ;;

	2-odd)

		case $1 in

			*[13579])			exit 0 ;;

			*)				exit 1 ;;

		esac ;;

	2-uspres)

		case $1 in

			*[02468][048]|*[13579][26])	exit 0 ;;

			*)				exit 1 ;;

		esac ;;

	2-*)

		echo "$0: wild type - $2" >&2 ;;

esac

echo "$0: usage is $0 year even|odd|uspres|nonpres|nonuspres" >&2

exit 1