I have entered the following expression in sagemath 9.0 on Linux
(3^2 * 4^2)-(8^2 - 3^2)//(6^2-9*8)
and sage gives 146 as the result. Nevertheless, I solved on paper and I get 145.
So my question is Am i doing something wrong with PEMDAS on sagemath?
Thank you in advance.
The behavior you observe is due to the floor division // having a higher precedence than the subtraction operator - but a lower precedence than the negative operator -, see the table of operator precedence. Compare:
sage: a = 8^2 - 3^2; a
55
sage: b = 6^2 - 9*8; b
-36
sage: n(a/b)
-1.52777777777778
sage: a//b
-2
sage: 0 - a//b # subtraction operator
2
sage: - a//b # negative operator
1
sage: 0 + (- a//b) # different from 0 - a//b
1
Asked: 2020-03-05 15:45:50 +0100
Seen: 557 times
Last updated: Mar 08 '20
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