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Evaluation question

Please explain to me the difference in the two computations:

lin=2*x - y + 2.0;lin(x=-11/9,y=-4/9)
-2.22044604925031e-16

and

2*(-11/9)-(-4/9)+2.000000000000000000
0.000000000000000000

It has to be a floating point computation, and I'm interested only in the sign of the outcome, which is why the first example gives me trouble.

Evaluation question

Please explain to me the difference in between the two computations:

lin=2*x - y + 2.0;lin(x=-11/9,y=-4/9)
-2.22044604925031e-16

and

2*(-11/9)-(-4/9)+2.000000000000000000
0.000000000000000000

It has to be a floating point computation, and I'm interested only in the sign of the outcome, which is why the first example gives me trouble.