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Posts tagged Arrays

Java – part 5

Sep05
2011 Leave a Comment Written by Eliott

Arrays

20111021-100101 AM.jpg

An array is a container object holding a fixed amount of objects of a single type, e.g 10 strings, 5 integers.

And because it is zero based the first element, first object in the array, is referenced as 0…

This is the long way:

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int[] anArray; // declares an array of integers
anArray = new int[10]; // allocates memory for 10 integers
 
anArray[0] = 100; // initialize first element
anArray[1] = 200; // initialize second element
anArray[2] = 300; // etc.
anArray[3] = 400;
anArray[4] = 500;
anArray[5] = 600;
anArray[6] = 700;
anArray[7] = 800;
anArray[8] = 900;
anArray[9] = 1000;
 
System.out.println("Element at index 0: " + anArray[0]);
System.out.println("Element at index 1: " + anArray[1]);
System.out.println("Element at index 2: " + anArray[2]);
System.out.println("Element at index 3: " + anArray[3]);
System.out.println("Element at index 4: " + anArray[4]);
System.out.println("Element at index 5: " + anArray[5]);
System.out.println("Element at index 6: " + anArray[6]);
System.out.println("Element at index 7: " + anArray[7]);
System.out.println("Element at index 8: " + anArray[8]);
System.out.println("Element at index 9: " + anArray[9]);

Here’s the short way:

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int[] anArray = {100, 200, 300}

See, it’s really that easy…

Posted in Java, Tutorials - Tagged

Java – part 3

Sep01
2011 Leave a Comment Written by Eliott

Literals

Notice that in the last post we didn’t have define the variable with “new” or similar? Well that’s because variable types are built into the language and so are automatically detected.

Integers

Generally you will only use the decimal system, however Java does allow the following:

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int decVal = 26; // The number 26, in decimal
int hexVal = 0x1a; // The number 26, in hexadecimal
int binVal = 0b11010; // The number 26, in binary

Float and Double

A floating-point literal is of type float if it ends with the letter F or f; otherwise its type is double and it can optionally end with the letter D or d.

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double d1 = 123.4;
double d2 = 1.234e2; // same value as d1, but in scientific notation
float f1  = 123.4f;

String and Char

Literals of types char and String may contain any Unicode (UTF-16) characters as long as your editor and system can read them. It also understands many escaped characters such as:

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\b (backspace), \t (tab), \n (line feed), \f (form feed), \r (carriage return), \" (double quote), \' (single quote), and \\ (backslash).
Posted in Java, Tools - Tagged

PHP Strings as Arrays

Aug24
2011 Leave a Comment Written by Eliott

Earlier I found out…

That strings can work like arrays, how?

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$string = "Hello World";
$letter1 = $string[2]; // 'l'
$letter2 = $string[5]; // ' '
$letter3 = $string[6]; // 'W'

Any use?

Posted in Php, Ramblings, Tutorials - Tagged

Ordering an array with PHP in 2 ways

Jul13
2011 Leave a Comment Written by Eliott

On the back of the last tutorial:

What I want:

First order by ratio and then for similar ratios take the most wins:

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function compareRatioThenWins($b, $a){
	if ($a[4] == $b[4]){
		if($a[1] == $b[1]){
			return 0;
		}else{
			return ($a[1] < $b[1]) ? -1 : 1;
		}
	}else{
		return ($a[4] < $b[4]) ? -1 : 1;
	}
}
usort($players, 'compareRatioThenWins');
Posted in Php, Tutorials - Tagged , ,

Ordering an array with PHP

Jul11
2011 Leave a Comment Written by Eliott

Can I order an array please?

If you want to order an array based on it’s values you can use this:

Let’s say you had this:
(Name, Wins, Loses, Ratio)

$array = array(
array(“Player1″, 8, 8, 1.00),
array(“Player2″, 6, 3, 2.00),
array(“Player3″, 12, 24, 0.5)
);

And you wanted to sort it by ratio then you would use:

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function compareRatio($a, $b){
	return strnatcmp($a[3], $b[3]);
}
usort($players, 'compareRatio');
Posted in Php, Tutorials - Tagged , ,

Naughts and Crosses Artificial Intelligence – part 1

Nov18
2010 Leave a Comment Written by Eliott
This entry is part 9 of 15 in the series Artificial Intelligence

Setting up

For our game to work we need something for the computer to work with, for this i’ll use an array!

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game = new Array()
game[0] = new Array(0, 0, 0)
game[1] = new Array(0, 0, 0)
game[2] = new Array(0, 0, 0)

Where 0 is empty, 1 = “O” and 2 = “X”

So the winning combinations (where all three values are either 1 or 2) are:

Horizontal:
game[0][0], game[0][1], game[0][2]
game[1][0], game[1][1], game[1][2]
game[2][0], game[2][1], game[2][2]

Vertical:
game[0][0], game[1][0], game[2][0]
game[0][1], game[1][1], game[2][1]
game[0][2], game[1][2], game[2][2]

Diagonal
game[0][0], game[1][1], game[2][2]
game[0][2], game[1][1], game[2][0]

Posted in Actionscript, Flash, Tutorials - Tagged , ,

AS3 key press automation

Oct31
2010 Leave a Comment Written by Eliott

Automating key press in AS3

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var keys:Array = new Array()
var key:Number = 0
var maxKeys = 100
for(key = 0; key < maxKeys; key++){
	keys[key] = false
}
 
stage.addEventListener(KeyboardEvent.KEY_DOWN,key_Down)
stage.addEventListener(KeyboardEvent.KEY_UP,key_Up)
 
function key_Down(event:KeyboardEvent):void{
	keys[event.keyCode] = true
	checkKeys()
}
function key_Up(event:KeyboardEvent):void{
	keys[event.keyCode] = false
	checkKeys()
}
function checkKeys(){
	if(keys[70]){
		trace("YOU PRESSED F")
	}
	if(keys[74]){
		trace("YOU PRESSED J")
	}
}

Then after using the code from my previous as3 code tutorial to find the key codes you can use the above to detect key press without coding anymore variables. NOTE, if you are using a key code higher than 100 change maxKeys to accommodate that and also those lower do not need a large array.

Posted in Actionscript, Flash, Tutorials - Tagged ,

Alternating table colours (with Php)

Oct17
2010 Leave a Comment Written by Eliott

Easy – css!

With CSS3 came a brand new feature… Alternate row colours :) 

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tr:nth-child(even) {background-color: #000000}
tr:nth-child(odd) {background-color: #F0F0F0}

Simple, no – not really. Many browsers cant read CSS3 – rendering that useless. Your probably going to want to use something better then…

In ‘for’ loops!

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<style>
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	.even { background-color:#000000; }
	.odd { background-color:#F0F0F0;}
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</style>
<?php
echo "<table>";
userNames = new Array(John, Fred, Bill, Connor);
for($i=0; $i<userNames.length; $i++){
	if($i % 2 == 0){
		$class = "even";
	}else{
		$class = "odd";
	}
	echo "<tr class=\"$class\">";
	echo "<td>userNames[$i]</td>";
	echo "</tr>";
	echo "<table>";
}
?>

Simple…

In ‘foreach’ loops

Here you can use the same principle…

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foreach(userNames as $i => $value)

and then you can easily check if it’s even or odd using the above code(s)

Posted in HTML, Php, Tutorials - Tagged , , ,

Mathematical functions – mean and median

Sep22
2010 1 Comment Written by Eliott

Mean and median

The mean is the statistical average for a set of numbers

Ok, so first we need a set of numbers – what better way than in an array!

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numbersList = new Array(17, 64, 84, 35, 23, 90, 5, 47)

Now the actual function – how are we going to work out the value?
We will add all the values together and divide the sum by how many values there are!

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function getMean(numbers){
	sum = 0
 	length = numbers.length
  	for(i=0; i<length ; i++){
   		sum += numbers[i]
	}
	mean = sum / length
	return mean
}

READ MORE »

Posted in Actionscript, Flash, Tutorials - Tagged ,

Minimum and maximum in an array

Sep20
2010 Leave a Comment Written by Eliott

Arrays again!

So, lets say our array contains; 17, 64, 84, 35, 23, 90, 5, 47

Now, we want to find out the minimum value in this array and so we firstly set up our array:

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numbers = new Array(17, 64, 84, 35, 23, 90, 5, 47)

Now the real code!

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min = numbers[0]
for (i=0; i<numbers.length; i++) {
	if (numbers[i]<min) {
		min = numbers[i]
	}
}

And for maximums:

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max = numbers[0]
for (i=0; i<numbers.length; i++) {
	if (numbers[i]>max) {
		max = numbers[i]
	}
}

So, setting the min / max value as the first value then searching through the rest. If a value is smaller / larger than the current min / max then it is overwritten!

Posted in Actionscript, Flash, Tutorials - Tagged
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