Search results
Feb 16, 2019 · You may have used it before as the "not" operator. However, since C# 8.0 and its new "nullable-reference-types" feature, the operator got a second meaning. 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.
Apr 25, 2010 · What set does 'null' belong to? JLS 4.1 The Kinds of Types and Values. There is also a special null type, the type of the expression null, which has no name. Because the null type has no name, it is impossible to declare a variable of the null type or to cast to the null type. The null reference is the only possible value of an expression of ...
Oct 12, 2013 · 10. Formally, null is a singleton member of the null type, which is defined to be the subtype of every other Java type. null is a reference type and its value is the only reference value which doesn't refer to any object. Therefore there is no representation of null in memory. The binary value of a reference-typed variable whose value is null ...
What does "/dev/null" mean at the end of shell commands. Ask Question Asked 11 years, 11 months ago.
Jul 7, 2010 · Structurally, most people who "cannot think of any technological reason null should be equal to false" get it wrong. Code is run by CPUs. Most (if not all) CPUs have bits, groups of bits and interpretations of groups of bits. That said, something can be 0, 1, a byte, a word, a dword, a qword and so on.
Feb 15, 2011 · It means the column accepts null values. This is the direct opposite of the NOT NULL declaration you see for your other columns, and is in fact the default declaration. For a column to have a default value of NULL, the declaration is DEFAULT NULL. That in turn implies, of course, that the column accepts null values. answered Feb 15, 2011 at 6:37.
Sep 6, 2017 · 8. Zero is a number value. It is a definite with precise mathematical properties. (You can do arithmetic on it ...) NULL means the absence of any value. You can't do anything with it except test for it. Blank is ill-defined. It means different things in different contexts to different people. For example:
The NULL value means "no data." NULL can be written in any lettercase. A synonym is \N (case sensitive). NOT NULL would mean the opposite of NULL, or not no data. Since some columns can be NULL, you use WHERE col IS NOT NULL to find values that are not "empty." answered Sep 7, 2012 at 18:06.
Apr 29, 2009 · It does not mean null is an instance of an object. It means: given the tree of primitive types in JavaScript, null is part of the "object-type primitive" subtree. This is explained more fully below. Details. undefined is a primitive value that represents the implicit absence of a value.
Dec 5, 2021 · This mainly relates to DTO or Entity Framework entities that are used in reflection-heavy frameworks. So there exists a syntax to tell the compiler to "shut up, I know it's null, trust me". In this line you explicitly assign null to the field and tell the compiler to trust you. answered Dec 5, 2021 at 15:54.
