What's this =! operator? [duplicate]

Answer 1

There could be three reasons for this:

1. It could be a mistyping of the != operator, meaning not equal to. Example:

   if (a != b) {
       // a is not equal to b
   }
   

2. It could be a mistyping a == !b, meaning a is equal to not b, which would most commonly be used with booleans. Example:

   if (a == !b) {
       // The boolean a is equal to not b (a is not equal to b)
   }
   

3. It could be trying to assign a to the inverse of b. Example:

   bool a = !b; // Sets a to the opposite of b