Examples
?- X is 13 >> 0.
X = 13
yes
?- X is 13 >> 1.
X = 6
yes
?- X is 13 >> 2.
X = 3
yes
?- X is 13 >> 3.
X = 1
yes
?- X is 13 >> 4.
X = 0
yesNote bit shifting using a negative value gives different results than in some other Prolog implementations.
?- X is 13 >> -1.
X = 0
yes