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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Doomsday-rule/ALGOL-W/doomsday-rule.alg Normal file
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begin % find the day of the week of dates using John Conway's Doomsday rule %
% returns the day of the week (Sunday = 0, Monday = 1,...) for the date %
% specified by ccyy, mm and dd %
integer procedure dow ( integer value ccyy, mm, dd ) ;
begin
integer doomsday, anchorDay;
logical isLeapYear;
doomsday := ( % Tuesday % 2
+ ( 5 * ( ccyy rem 4 ) )
+ ( 4 * ( ccyy rem 100 ) )
+ ( 6 * ( ccyy rem 400 ) )
)
rem 7;
isLeapYear := ccyy rem 4 = 0 and ( ccyy rem 100 not = 0 or ccyy rem 400 = 0 );
anchorDay := case mm of ( if isLeapYear then 4 else 3
, if isLeapYear then 1 else 7
, 7, 4, 2, 6, 4, 1, 5, 3, 7, 5
);
( doomsday + ( dd - anchorDay ) ) rem 7
end dow ;
begin % task test cases %
% prints a test date and its day of the week %
procedure testDow ( integer value ccyy, mm, dd ) ;
write( i_w := 1, s_w := 0
, ccyy
, "-", mm div 10, mm rem 10
, "-", dd div 10, dd rem 10
, ": ", dayName( dow( ccyy, mm, dd ) )
);
string(9) array dayName ( 0 :: 6 );
dayName( 0 ) := "Sunday"; dayName( 1 ) := "Monday"; dayName( 2 ) := "Tuesday";
dayName( 3 ) := "Wednesday"; dayName( 4 ) := "Thursday"; dayName( 5 ) := "Friday";
dayName( 6 ) := "Saturday";
testDow( 1800, 1, 6 );
testDow( 1875, 3, 29 );
testDow( 1915, 12, 7 );
testDow( 1970, 12, 23 );
testDow( 2043, 5, 14 );
testDow( 2077, 2, 12 );
testDow( 2101, 4, 2 );
testDow( 2022, 6, 19 )
end
end.