Added examples for Nit to samples.

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>

samples/Nit/clock.nit

@@ -0,0 +1,78 @@
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This module provide a simple wall clock.
+# It is an example of getters and setters.
+# A beefed-up module is available in clock_more
+module clock
+
+# A simple wall clock with 60 minutes and 12 hours.
+class Clock
+	# total number of minutes from 0 to 719
+	var total_minutes: Int
+	# Note: only the read acces is public, the write access is private.
+
+	# number of minutes in the current hour (from 0 to 59)
+	fun minutes: Int do return self.total_minutes % 60
+	
+	# set the number of minutes in the current hour.
+	# if m < 0 or m >= 60, the hour will be changed accordinlgy
+	fun minutes=(m: Int) do self.total_minutes = self.hours * 60 + m
+
+	# number of hours (from 0 to 11)
+	fun hours: Int do return self.total_minutes / 60
+
+	# set the number of hours
+	# the minutes will not be updated
+	fun hours=(h: Int) do self.total_minutes = h * 60 + minutes
+
+	# the position of the hour arrow in the [0..60[ interval
+	fun hour_pos: Int do return total_minutes / 12
+
+	# replace the arrow of hours (from 0 to 59).
+	# the hours and the minutes will be updated.
+	fun hour_pos=(h: Int) do self.total_minutes = h * 12
+
+	redef fun to_s do return "{hours}:{minutes}"
+
+	fun reset(hours, minutes: Int) do self.total_minutes = hours*60 + minutes
+
+	init(hours, minutes: Int) do self.reset(hours, minutes)
+
+	redef fun ==(o)
+	do
+		# Note: o is a nullable Object, a type test is required
+		# Thanks to adaptive typing, there is no downcast
+		# i.e. the code is safe!
+		return o isa Clock and self.total_minutes == o.total_minutes
+	end
+end
+
+var c = new Clock(10,50)
+print "It's {c} o'clock."
+
+c.minutes += 22
+print "Now it's {c} o'clock."
+
+print "The short arrow in on the {c.hour_pos/5} and the long arrow in on the {c.minutes/5}."
+
+c.hours -= 2
+print "Now it's {c} o'clock."
+
+var c2 = new Clock(9, 11)
+print "It's {c2} on the second clock."
+print "The two clocks are synchronized: {c == c2}."
+c2.minutes += 1
+print "It's now {c2} on the second clock."
+print "The two clocks are synchronized: {c == c2}."