Why do most programming languages only have binary equality comparison operators?

Question

In natural languages, we would say \"some color is a primary color if the color is red, blue, or yellow.\"

In every programming language I\'ve seen, that translates

Answer 1

I'm reminded of when I first started to learn programming, in Basic, and at one point I wrote

if X=3 OR 4

I intended this like you are describing, if X is either 3 or 4. The compiler interpreted it as:

if (X=3) OR (4)

That is, if X=3 is true, or if 4 is true. As it defined anything non-zero as true, 4 is true, anything OR TRUE is true, and so the expression was always true. I spent a long time figuring that one out.

I don't claim this adds anything to the discussion. I just thought it might be a mildly amusing anecdote.