Anonymous user
Ethiopian multiplication: Difference between revisions
→{{header|Oz}}: improved readibility
(Added Oz example.) |
(→{{header|Oz}}: improved readibility) |
||
Line 1,063:
=={{header|Oz}}==
<lang oz>declare
fun {Halve X} X div 2 end
fun {Double X} X * 2 end
fun {Even X} {Abs X mod 2} == 0 end %% standard function: Int.isEven
fun {EthiopicMult X Y}
X >= 0 = true %% assert: X must not be negative
Rows = for
L in X; L>0; {Halve L} %% C-like iterator: "Init; While; Next"
R in Y; true; {Double R}
collect:
OddRows = {Filter Rows
RightColumn = {Map OddRows SelectRight}
in
{Sum RightColumn}
end
%% Helpers
fun {LeftIsOdd L#_} {Not {Even L}} end
fun {SelectRight _#R} R end
fun {Sum Xs} {FoldL Xs Number.'+' 0} end
in
{Show {EthiopicMult 17 34}}</lang>
| |||