#149 Bug in XNOR truth table

[Tshongor Kmerentsi]

Hey!

I've found a bug in the truth table of the 3 and 4 input XNOR gate (pictures attached) in version 2.7.1

XNOR(true,true,true) should be false, but the output is true
XNOR(true,true,true,false) should be false, but the output is true

Sincerely,
Tshongor

[Tshongor Kmerentsi]

I traced back the issue. In the XnorGate.java in the computeOutput function in case the code runs to the else branch, it calls computeExactlyOne function, which is nonsense. The if statement should be replaced with a simple call to the computeOddParity function

[Roelens]

No bug, xnor is thru for an odd number of thru. This is why xnor is useful for parity test..

[Tshongor Kmerentsi]