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Computer software has to be "loaded" into the computer's storage such as the hard drive or memory. Once the software has loaded, the computer is able to execute the software. This involves passing instructions from the application software, through the system software, to the hardware which ultimately receives the instruction as machine code. Each instruction causes the computer to carry out an operation—moving data, carrying out a computation, or altering the control flow of instructions.
Data movement is typically from one place in memory to another. Sometimes it involves moving data between memory and registers which enable high-speed data access in the CPU. Moving data, especially large amounts of it, can be costly. So, this is sometimes avoided by using "pointers" to data instead. Computations include simple operations such as incrementing the value of a variable data element. More complex computations may involve many operations and data elements together.
IT & SOFTWARE . A programming language is a formal constructed language designed to communicate instructions to amachine, particularly a computer. Programming languages can be used to create programs to control the behavior of a machine or to express algorithms.
The earliest programming languages preceded the invention of the digital computer and were used to direct the behavior of machines such as Jacquard looms and player pianos. Thousands of different programming languages have been created, mainly in the computer field, and many more still are being created every year. Many programming languages require computation to be specified in an imperative form (i.e., as a sequence of operations to perform), while other languages use other forms of program specification such as the declarative form i.e. the desired result is specified, not how to achieve it.
The description of a programming language is usually split into the two components of syntax (form) and semantics (meaning). Some languages are defined by a specification document example the C programming language is specified by an ISO Standard), while other languages (such as Perl) have a dominant implementation that is treated as a reference.
A software language is an artificial language used in the development of software systems. The term is more general than programming language and also includes modeling languages, query languages, transformation languages, schemas, domain-specific languages, and markup languages.
Java
Java is a full object-oriented language, strongly typed, with an extensive feature set focused on networking and cross-platform compatibility. Applications written in Java can run on virtually any OS – though the performance won't be as good as something designed to run natively.
It is the language of choice for most Computer Science courses, and consequently almost everyone has at least a little Java programming experience. Android applications are written in Java too, though you can't simply run a regular Java app on your Android mobile nor vice-versa.
C/C++
Though actually separate languages, they are often grouped together, as C++ is basically an enhanced version of C, adding object oriented features. C++ is the serious programmer's language of choice, forming the basis of most computer games and most advanced Windows software. It's high performance, but requires a lot more precision on the programmers part when it comes to memorymanagement and consequently has a steep learning curve. Not recommended for absolute beginners.
Instead of lots of commands to output HTML (as seen in C or Perl), PHP pages contain HTML with embedded code that does "something" (in this case, output "Hi, I'm a PHP script!"). The PHP code is enclosed in special start and end processing instructions that allow you to jump into and out of "PHP mode."
What distinguishes PHP from something like client-side JavaScript is that the code is executed on the server, generating HTML which is then sent to the client. The client would receive the results of running that script, but would not know what the underlying code was. You can even configure your web server to process all your HTML files with PHP, and then there's really no way that users can tell what you have up your sleeve.
The best things in using PHP are that it is extremely simple for a newcomer, but offers many advanced features for a professional programmer. Don't be afraid reading the long list of PHP's features. You can jump in, in a short time, and start writing simple scripts in a few hours.
Although PHP's development is focused on server-side scripting, you can do much more with it. Read on, and see more in the What can PHP do? section, or go right to the introductory tutorial if you are only interested in web programming.