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44 comments### Binary options directory

I added a phrase on the notion of "single input" which seems not very meaningful to me. An example should be added e. Isn't factorial an unary oparation? All the operations you consider not unary are special cases of binary operations.

If one operand in a binary operation is fixed, we have a unary operation on the other operand. So while all these operations can be described by binary operations, the operations as described in the article are unary operations. The negation on real numbers in particular is a good example of this - while it is the same as multiplying by -1, it is quite natural to define this unary operation taking the additive inverse without having any notion of multiplication.

How about the difference operator? Can it also be considered a unary operator? The output of the examples given is clearly wrong.

Seth Arlington talk That call invokes undefined behavior in C, not merely implmentation-defined behavior, because it attempts to modify i twice between two sequence points. Thus a compiler can generate any kind of output, including printing nothing, or crashing the program. A compiler is not even required to diagnose instances of undefined behavior, so running this through every compiler won't help settle the question.

It's a terrible example. Here is a much better example which doesn't invoke undefined behavior, yet does generate different results depending on the order the arguments to printf are evaluated:.

It can legally print either 1,2 or 2,1, nothing else. I can't think of a shorter one that doesn't invoke undefined behavior or use other language facilities that would require explanation.

According to the Operation page an operation is just a function, and a unary operation would thus simply be a function with exactly one operand. In fact, all functions could be seen as unary operations, as taking multiple operands is just a matter of notation: Binary and ternary operations can't be confused this way, as the element x,y,z - a 3-tuple - is different from x, y,z - a 2-tuple.

Defining the arity of an operation s. In neither of these cases does this reflect anything like a unary operation, as neither need operate on a variable at all, and if they do, the variable needs a second sigil. Hopefully this makes sense to everyone? From Wikipedia, the free encyclopedia. Retrieved from " https: Mathematics articles related to general mathematics Start-Class mathematics articles Mid-Priority mathematics articles.

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