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#### Prestwood eMagazine

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 ► KB ► Programming ► Delphi Prism ► Language Basics
From the March 2016 Issue of Prestwood eMag
 Prism Language Basics:Delphi Prism Unary Operators
Posted 10 years ago on 2/12/2009
Prism Code Snippet:
 To/From Code Guide: Delphi Prism Unary O... vs. Other Languages  A flashcard from our Prism Flashcards Library  A code snippet from our Prism Code Snippets Page

### 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: Unary Operators

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

### Delphi Prism Unary Operators

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

### Inc() and Dec()

Inc will increment an ordinal or float named variable by 1 or a value you specify. Dec will decrement a named variable by 1 or a value you specify.

#### Examples:

var i: Integer := 1;
Inc(i);  //Increment by 1 (default).
Inc(i, 3);  //Increment by 3.
Dec(i);     //Decrement by 1 (default).
Dec(i, 3);  //Decrement by 3.

//The following displays 3.65.
var i: Double := 1;
Inc(i, 2.65); //Increment by 2.65.

MessageBox.Show("" + i);

 Definition: Unary Operator

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