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c# - What does null! statement mean? - Stack Overflow It can be used on a type to control Nullability, it is then called the "Null Forgiving Operator" Basically, null! applies the ! operator to the value null This overrides the nullability of the value null to non-nullable, telling the compiler that null is a "non-null" type
What is null in Java? - Stack Overflow The null reference can always be cast to any reference type In practice, the programmer can ignore the null type and just pretend that null is merely a special literal that can be of any reference type What is null? As the JLS quote above says, in practice you can simply pretend that it's "merely a special literal that can be of any reference
What is the difference between is not null and != null? The main difference between e != null and e is not null is the way the the compiler executes the comparison Microsoft: "The compiler guarantees that no user-overloaded equality operator == is invoked when expression x is null is evaluated " Bottom Line: If you are writing code that you don't want to depend on someone's implementation of the != and == operators, use is null and is not null
How can I check for an undefined or null variable in JavaScript? The one benefit I can see is that it does not require knowing that == null and != null treat a declared variable with value undefined as equal to null IMHO, that isn't reason enough to use this unfamiliar (and inefficent - creates an array every time) syntax
What is the difference between x is null and x == null? 173 Overloaded equals operator There is in fact a difference in semantics between the two comparisons when you are comparing null with a type that has overloaded the == operator foo is null will use direct reference comparison to determine the result, whereas foo == null will of course run the overloaded == operator if it exists
c# - Math operations with null - Stack Overflow The operators for Nullable<T> are so-called "lifted" operators]; the c# compiler takes the operators available for T and applies a set of pre-defined rules; for example, with +, the lifted + is null if either operand is null, else the sum of the inner values Re the last; again, division is defined as null if either operand is null - it never performs the division
What exactly is meant by dereferencing a NULL pointer? In other words, a null pointer is a pointer of any type pointing at a well-defined "nowhere" Any pointer can turn into a null pointer when it is assigned a null pointer constant The standard mentions 0 and (void*)0 as two valid null pointer constants, but note that it says "an integer constant expression with the value 0 "