Prestwood IT: Delphi Prism Unary Operators (Delphi Prism)

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► KB ► Programming ► Delphi Prism ► Language Basics

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From the March 2016 Issue of Prestwood eMag

Prism Language Basics:

Delphi Prism Unary Operators

By Mike Prestwood

Posted 15 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

Tags: Delphi Prism , Unary Operators

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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