programming languages tutorials

Posted: 29 Dec 2012 12:52 AM PST

Associative Arrays
An associative array, each ID key is associated with a value.
When storing data about specific named values, a numerical array is not always the best way to
do it.
With associative arrays we can use the values as keys and assign values to them.
Example 1
In this example we use an array to assign ages to the different persons:
$ages = array("Peter"=>32, "Quagmire"=>30, "Joe"=>34);

Example 2
This example is the same as example 1, but shows a different way of creating the array:
>

$ages['Peter'] = "32";
$ages['Quagmire'] = "30";
$ages['Joe'] = "34";

The ID keys can be used in a script:

<
?php
$ages['Peter'] = "32";
$ages['Quagmire'] = "30";
$ages['Joe'] = "34";
echo "Peter is " . $ages['Peter'] . " years old.";
?>

The code above will output:
Peter is 32 years old.

Numeric array in php

Posted: 28 Dec 2012 10:01 PM PST

Numeric Arrays
A numeric array stores each element with a numeric ID key.
There are different ways to create a numeric array.
Example 1
In this example the ID key is automatically assigned: PDF by Hans Home Collection

$names = array("Peter","Quagmire","Joe");

Example 2
In this example we assign the ID key manually:

$names[0] = "Peter";
$names[1] = "Quagmire";
$names[2] = "Joe";

The ID keys can be used in a script:

<?php
$names[0] = "Peter";
$names[1] = "Quagmire";
$names[2] = "Joe";
echo $names[1] . " and " . $names[2] .
" are ". $names[0] . "'s neighbors";
?>

The code above will output:
Quagmire and Joe are Peter's neighbors

java.io package

Posted: 20 Dec 2011 04:34 AM PST

An overview of the java.io package
Introduction
This section introduces the java.iopackage.
Here are some basic points about I/O:

* Data in files on your system is called persistent data because it persists after the
program runs.
* Files are created through streams in Java code.
* A stream is a linear, sequential flow of bytes of input or output data.
* Streams are written to the file system to create files.
* Streams can also be transferred over the Internet.
* Three streams are created for us automatically:

Syst*em.out - standard output stream
Syst*em.in - standard input stream
Syst*em.err - standard error

* Input/output on the local file system using applets is dependent on the browser's
security manager. Typically, I/O is not done using applets. On the other hand,
stand-alone applications have no security manager by default unless the developer has
added that functionality.

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programming languages tutorials

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