First time here? First time here? Newsletter Signup Newsletter
Search tutorials
Author: Steve Happ | Website: http://www.video-animation.com


Comments are helpful lines that are not compiled.

  • They help readers understand our program,
  • summarize a function's algorithm,
  • identify the purpose of a variable, or
  • clarify a segment of code.

There are two types.

  1. Multiple Lines ( /* */ )
    An explanation of a section of code or
     a coder's name and date
    and other stuff
  2. Single Line delimiters (//)
    // number of record
    var recordNum ;


Operators are signs that do something to variables on either side of them. Here are the arithmetic operators:

Operator Name Example
* Multiplication X* Y
/ Division X/Y
% Modulus X % Y
+ Addition X + Y
- Subtraction X - Y

The Modulus operator(%) computes the remainder of division between 2 integers.
e.g. 5 % 2 = 1
5/2 = (2*2) + 1(remainder)
Try it out! Ex1.

 var x = 3;
 var y = 5;
 var mult1 =  x * y;
 trace(x + " times " + y + " = " + mult1);
var min = 35;
var max = 239;
var addition = min + max;
trace(min + " plus " + max + " = " + addition;
You get the idea. Try all the operators and start writing your own scripts.

Equality, Relational and Logical Operators

These operators evaluate to true or false

Logical AND (&&)

Evaluates to true only if both its operands evaluate to true. E.g.

 x = 5;
 if(x>0 && x < 10){
something = true;

Logical OR ( || )

Evaluates to true if either of its operands evaluate to true. E.g.

 x = 5;
If(x>0 || x<4){
something = true;

Operator Name Example
! Logical NOT (!hasFired)
< Less than x < y
> Greater than x> y
<= Less than or equal to x <= y
>= Greater than or equal to x >= 24
== Equality if(hasFired == true)
!= Inequality If( x != 7)
&& Logical AND x >0 && x < 10
|| Logical OR x< 0 || x > 20

Assignment Operator ( = )

The effect that an assignment has is to store a new value in the left operand's associated memory storage space e.g.

 x = 7;
This statement means that the value 7 is assigned to the variable x.

Increment and decrement Operators ( ++ and -- )

The increment (++) and decrement (--) operators are a shortcut way of adding or subtracting 1 from a variable. E.g.
Prefix increment - ++c; // c = c+1
Postfix increment - c++;
The prefix form of ++ increments the value of the variable before that value is used.

stack[++top] = val;
//Is equivalent to the following 2 lines
top = top +1;
stack[top] = val;
The postfix form of ( --) decrements the value of top after that value is used.
stack[top--] = val;
//Is equivalent to :
	 stack[top] = v;
	top = top -1;

» Level Basic

Added: 2005-08-10
Rating: 8 Votes: 12
» Author
Steve Happ is the founder of Steve's Tutes and has been going hard at it developing Flash for Web and CD-rom.
» Download
Download the files used in this tutorial.
» Forums
More help? Search our boards for quick answers!
Featured Flash FLA
» Author: Inocreato
» Title: RaiseTheBlocks
» Description: Raise all the blocks to win the game
Featured Sound Loops
Image for equalize

Audio Player

» Author: TomCat Carty
» Title: The Wood
» Description: Just a little game ending or it can maybe be looped. Recorders with music box and percussion to give the feel of well, I don't know, the woods? Free to use, just credit me. thank you
Latest Font
» Author: Fábio FAFERS
» Description: I created this font for free use. Everyone can apply it in personal or business texts. Its free, but I want to be communicated in case of business use. Donations are accepted to keep the project of free fonts alive! Thank you all
Featured Sound Fx
Image for equalize

Audio Player

» Author: Davisigner
» Description: Hmm... what to say about this one? It's reminiscent of the closing notes of the opening music from the Three Stooges done in a church organ style with a closing cymbal crash. I'll give this one away gratis, but feel free to check out my free loops and potential upcoming license-mandated ones over in the respective part of Flashkit.