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   ► KBProgrammingDelphi PrismLanguage Basics   Print This     
  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:
 A flashcard from our Prism Flashcards Library
 A code snippet from our Prism Code Snippets Page

KB101896



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);

More Info

Definition:  Unary Operator

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Code Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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