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real language
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Language SR
| Date: | 04/20/05 |
| Author: | David Larsson |
| URL: | n/a |
| Comments: | 0 |
| Info: | http://www.dd.chalmers.se/~f92dala |
| Score: |  (3.25 in 4 votes) |
# SR version of 99 bottles of beer
# by David Larsson
# mailto:f92dala@dd.chalmers.se http://www.dd.chalmers.se/~f92dala
#
# This version demonstrates some of SR's concurrent aspects, simulating
# the (common?) situation where 99 people drink one bottle of beer each
# simultaneously, while singing exactly one verse of the song.
#
resource main()
op sing_it(int; string[120])
# Create 99 processes (or, rather, threads)
# for the verses in the song
process swing_it(bottle := 1 to 99)
var bottle1_str, bottle2_str : string[15];
if bottle > 2 ->
bottle1_str := string(bottle) || " bottles";
bottle2_str := string(bottle-1) || " bottles";
[] bottle = 2 ->
bottle1_str := "2 bottles";
bottle2_str := "1 bottle";
[] else ->
bottle1_str := "1 bottle";
bottle2_str := "No more bottles";
fi
# Send the verse back to the main thread
send sing_it(bottle,
bottle1_str || " of beer on the wall, "
|| bottle1_str || " of beer...\n"
|| "Take one down and pass it around\n"
|| bottle2_str || " of beer on the wall\n");
end swing_it
# Make sure the verses get printed in the right order
fa expected := 99 downto 1 ->
in sing_it(bottle, verse) st bottle = expected ->
write(verse);
ni
af
# I guess the bartender sings this one
write("Go to the store, buy some more!");
write("99 bottles of beer on the wall");
end main
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