What's this =! operator?

Question

I was surprised by this code: if (a =! b) { // let it be on false ... }But `a` is never assigned by a value. What's this operator about?

Answer 1

it compares a and b. It is the equivalent of NOT EQUAL. If the values are equal it evaluates as FALSE otherwise it evaluates to TRUE. It does not assign values.

common relational operators

< less than

> greater than

<= less than or equal to

>= greater than or equal to

== equal

!= not equal

see C# arithmetic, comparison, logical, and assignment operators - C# | Microsoft Learn for more information.