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[Sync Iteration] 8th/triangle/2 #13

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[Sync Iteration] 8th/triangle/2 #13

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36 changes: 36 additions & 0 deletions solutions/8th/triangle/2/triangle.8th
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Original file line number Diff line number Diff line change
@@ -0,0 +1,36 @@
: istriangle? \ n n n -- T
3dup
3dup n:- n:abs swap n:< -3 roll
rot 3dup n:- n:abs swap n:< -3 roll
rot n:- n:abs swap n:<
and and
;

: equilateral? \ n n n -- T
istriangle? not if 3drop false
else
2dup n:= -3 roll
rot n:=
drop and
then
;

: scalene? \ n n n -- T
istriangle? not if 3drop false
else
2dup n:= not -3 roll
rot 2dup n:= not -3 roll
rot 2dup n:= not -3 roll
3drop and and
then
;

: isosceles? \ n n n -- T
istriangle? not if 3drop false
else
2dup n:= -3 roll
rot 2dup n:= -3 roll
rot 2dup n:= -3 roll
3drop xor xor
then
;