Ethiopian multiplication: Difference between revisions
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m (→{{header|REXX}}: added/changed comments, added subroutine fence, added whitespace. -- ~~~~) |
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=={{header|REXX}}== |
=={{header|REXX}}== |
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<lang rexx> |
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numeric digits 1000 /*handle very large integers. */ |
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parse arg a b . /*handles zeroes & negative ints.*/ |
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/*A & B should be checked if ints*/ |
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say 'a=' a |
say 'a=' a |
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say 'b=' b |
say 'b=' b |
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say 'product=' emult(a,b) |
say 'product=' emult(a,b) |
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exit |
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/*──────────────────────────────────EMULT subroutine────────────────────*/ |
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emult: procedure; parse arg x 1 ox,y |
emult: procedure; parse arg x 1 ox,y |
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prod=0 |
prod=0 |
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do while x\==0 |
do while x\==0 |
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if \iseven(x) then prod=prod+y |
if \iseven(x) then prod=prod+y |
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x=halve(x) |
x=halve(x) |
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y=double(y) |
y=double(y) |
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end |
end |
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return prod*sign(ox) |
return prod*sign(ox) |
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/*──────────────────────────────────subroutines─────────────────────────*/ |
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halve: return arg(1)%2 |
halve: return arg(1)%2 |
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double: return arg(1)*2 |
double: return arg(1)*2 |
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halve: procedure; parse arg ?; return ?%2 |
halve: procedure; parse arg ?; return ?%2 |
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double: procedure; parse arg x; return x+x |
double: procedure; parse arg x; return x+x |
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iseven: procedure; parse arg _; return _//2 == 0 |
iseven: procedure; parse arg _; return _//2 == 0</lang> |
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</lang> |
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=={{header|Ruby}}== |
=={{header|Ruby}}== |
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