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|
--
-- Originally written by Cyril ADRIAN and Antony LE LABOUSSE
--
class SPREAD_ILLNESS
-- To compile type command : compile SPREAD_ILLNESS make
--
-- Also try Optimised version adding options "-boost -O2"
--
creation make
feature {NONE}
world1, world2: ARRAY2[INTEGER];
empty : INTEGER is 1;
healthy : INTEGER is 0;
di: ARRAY[INTEGER] is
once
Result := <<-1,-1,-1,0,1,1,1,0 >>
end;
dj: ARRAY[INTEGER] is
once
Result := <<-1,0,1,1,1,0,-1,-1 >>
end;
error_msg : STRING is "Error : do it again !%N"
yes_or_no(question: STRING; default_answer: BOOLEAN): BOOLEAN is
do
io.put_string(question);
io.put_string("(y/n)? ");
if default_answer then
io.put_string("[y]");
else
io.put_string("[n]");
end;
io.flush;
io.read_line;
io.last_string.to_lower;
if io.last_string.is_empty then
Result := default_answer;
elseif io.last_string.first = 'y' then
Result := true;
elseif io.last_string.first = 'n' then
else
Result := yes_or_no(question,default_answer);
end;
end;
feature
make is
-- Try to spreads an illness through a set of people.
local
day: INTEGER;
fed_up: BOOLEAN;
do
from
day := 1;
first_day;
until
fed_up
loop
io.put_string("Day #");
io.put_integer(day);
io.put_new_line;
display;
fed_up := yes_or_no("Exit spread_illness",false);
day := day + 1;
next_day
end;
end;
first_day is
-- Create the world in the 1st day's state.
local
i, j, ill_state: INTEGER;
ok: BOOLEAN;
do
if yes_or_no("Default First World",true) then
!!world1.from_model(
<<<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-1>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>,
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>>>);
else
io.put_string("World size: ");
io.flush;
io.read_integer;
!!world1.make(1,io.last_integer,1,io.last_integer);
io.put_string("%Ne)mpty, i)ll with number of days, h)ealthy%N%N");
from
i := world1.lower1
until
i > world1.upper1
loop
from
j := world1.lower2
until
j > world1.upper2
loop
from
ok := false;
until
ok
loop
io.put_string("State of [");
io.put_integer(i);
io.put_character(',');
io.put_integer(j);
io.put_string("] : ");
io.flush;
io.read_word;
inspect
io.last_string.first
when 'E','e' then
if io.last_string.count /= 1 then
io.put_string(error_msg)
else
world1.put(empty,i,j);
ok := true
end
when 'H','h' then
if io.last_string.count /= 1 then
io.put_string(error_msg)
else
world1.put(healthy,i,j);
ok := true
end
when 'I','i' then
ok := true;
io.flush;
io.read_integer;
ill_state := io.last_integer;
ill_state := ill_state.max(1);
ill_state := ill_state.min(4);
world1.put(- ill_state,i,j);
else
io.put_string(error_msg)
end;
end;
j := j + 1;
end;
i := i + 1;
end;
end;
world2 := clone(world1)
end;
display is
-- Displays current `world2'.
local
i,j : INTEGER;
do
io.put_character('+');
io.put_character('-');
from
i := world1.lower1
until
i > world1.upper1
loop
io.put_character('-');
io.put_character('-');
i := i+1
end;
io.put_character('+');
io.put_new_line;
from
i := world1.lower1
until
i > world1.upper1
loop
io.put_character('|');
io.put_character(' ');
from
j := world1.lower2
until
j > world1.upper2
loop
inspect
world2.item(i,j)
when empty then
io.put_character(' ')
when healthy then
io.put_character('O')
else
io.put_character((- world2.item(i,j)).digit)
end;
io.put_character(' ');
j := j+1
end;
io.put_character('|');
io.put_new_line;
i := i+1
end;
io.put_character('+');
io.put_character('-');
from
i := world1.lower1
until
i > world1.upper1
loop
io.put_character('-');
io.put_character('-');
i := i+1
end;
io.put_character('+');
io.put_new_line;
end;
next_day is
-- `world1' and `world2' are swapped.
local
i,j: INTEGER;
do
world1.copy(world2);
from
i := world1.lower1;
until
i > world1.upper1
loop
from
j := world1.lower2;
until
j > world1.upper2
loop
inspect
world1.item(i,j)
when empty then
when healthy then
spread(i,j);
else
cure_or_die(i,j);
end;
j := j + 1;
end;
i := i + 1;
end;
end;
feature {NONE}
cure_or_die(i,j : INTEGER) is
-- When ill, inspects if must be death or more ill or cured.
do
inspect
- world1.item(i,j)
when 1 then
world2.put(-2,i,j)
when 2 then
die(i,j)
when 3 then
world2.put(-4,i,j)
when 4 then
world2.put(healthy,i,j)
end
end;
die(i,j: INTEGER) is
-- When two days ill, dies or more ill ?
local
d,k:INTEGER;
do
from
d := 1;
variant
9 - d
until
d > 8
loop
if v(i+di.item(d),j+dj.item(d)) <= -2 then
k := k+1;
end;
d := d+1;
end;
if k >= 4 then
world2.put(empty,i,j);
else
world2.put(-3,i,j);
end
end;
spread(i,j: INTEGER) is
-- spread the illness ?
local
d: INTEGER;
do
from
d := 1;
variant
10 - d
until
d = 9
loop
if ill(i + di @ d , j + dj @ d) then
world2.put(-1,i,j);
d := 9;
else
d := d+1;
end
end
end;
ill(i,j: INTEGER): BOOLEAN is
-- Is there someone is ill at `i', `j'.
do
Result := (v(i,j) < 0)
end;
v(i,j: INTEGER): INTEGER is
-- Gives `empty' when out of range or the
-- value in `world1'
do
if (world1.lower1 <= i and then i <= world1.upper1)
and (world1.lower2 <= j and then j <= world1.upper2) then
Result := world1.item(i,j)
else
Result := empty
end;
end;
end -- SPREAD_ILLNESS
|
