What are some situations where you might find it useful to use the "!" symbol in a program?

The NOT operator can be useful to excludes unwanted items (or irrelevant items).

Explanation:

In a lot of computer languages, the "!" symbol stands for the Boolean operator "NOT".

The NOT operator can be useful to excludes unwanted items (or irrelevant items).

Suppose you want to check if two conditions are not equal to each other, and when that condition is true, you can control some specific the outcome, or let something happen ...

if (condition1! = condition2) then

whatever you want done ...

end if