Prestwood IT: Unary Operators (Cross Reference Coding Encyclopedia: Delphi Prism)

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Unary Operators

General Info: Unary Operator

An operation with only one operand (a single input). Common unary operators include + plus, - minus, and bitwise not. Some operators can function as both unary and binary operators. For example, + and - operators can serve as either.

Languages Focus

What unary operators are supported in additoin to the standard plus, minus, and bitwise not.

Delphi Prism:

The obvious Prism unary operators are +, -, and Not.

+	Plus
-	Minus
Not	Bitwise Not
Inc()	Increment
Dec()	Decrement

Syntax Example:

var i: Integer := 1;
Inc(i);
MessageBox.Show("" + i);  //Displays 2

Delphi Prism Unary Operators

Cross Reference Examples:

Access VBA:

An operation with only one operand (a single input) such as +, -, and Not.

Access VBA Unary Operators

ASP Classic:

An operation with only one operand (a single input) such as +, -, and Not.

ASP Classic Unary Operators

C#:

An operation with only one operand (a single input). The following are the C# unary operators: +, -, !, ~, ++, --, true, or false.

C# Unary Operators

C++:

An operation with only one operand (a single input) such as ++X and --Y.

More Info / Comment

C Family Unary Operators

Corel Paradox:

The ObjectPAL unary operators are:

+
-
Not

More Info / Comment

Delphi:

An operation with only one operand (a single input). In Object Pascal, a unary operator has the highest precedence and always precedes its operand (for example, -B), except for the ^ pointer operator, which follows its operand (for example, P^). In addition to the obvious +, -, and Not operators, Delphi also offers:

^	Pointer
@	returns the address of a variable, function, procedure, or method; a pointer to its operand.
inc()	Increment
dec()	Decrement

The TYPE operator is also a unary operator and is valuated at compile time. The TYPE operator returns the size in bytes of the operand,

More Info / Comment

Java:

An operation with only one operand (a single input). The Java unary operators are ++, --, +, -, ~, and !.

+ Indicates positive value (numbers are positive without this)
- Negates an expression
++ Increment operator by 1
-- Decrement operator by 1
! Logical complement operator (inverts the value of a boolean)
~ Bitwise inversion operator (works on integral data types)

More Info / Comment

JavaScript:

An operation with only one operand (a single input). JavaScript unary operators include ++ and --. They can be used either before or after a variable as in: a++, b--, and ++a, and --b.

Examples:

iCounter++;

iCounter--;

++iCounter;

--iCounter;

Syntax Example:

var iCounter=0;

for (iCounter=0;iCounter<=5;iCounter++)
{
  document.write("Count is " + iCounter + "<br>");
}

JavaScript Unary Operators

Perl:

An operation with only one operand (a single input). The following are the Perl unary operators: !, -, ~, +, \, &, and *.

! performs logical negation which is "not"
- performs arithmetic negation if the operand is numeric.
~ performs bitwise negation, that is 1's complement.
+ has no semantic effect whatsoever, even on strings.
\ creates a reference to whatsoever follows.
& Address of operator.
* Dereference address operator.

Perl Unary Operators

PHP:

A unary operator operates on only one value.

PHP Examples:

! negation operator
++ increment operator
-- decrement operator

PHP Unary Operators

VB Classic:

An operation with only one operand (a single input) such as +, -, and Not.

VB Classic Unary Operators

VB.Net:

An operation with only one operand (a single input). A unary operator method can return any type but takes only one parameter, which must be the type of the containing class. In addition to the obvious +, -, and Not operators, VB.Net also offers:

isFalse
isTrue

VB.Net Unary Operators