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