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The work of computer programmers or software engineers, as they are called in the computer industry, involves writing detailed sets of instructions according to the problem descriptions and specifications of the systems analysts These programs are made up of a series of logical steps that the machine must follow in order for the data to be processed and transformed into usable information The programmer may use any one of a number of programming languages COBOL, Java, C++, and C are among the languages most employers seek Other development tools widely used today are Microsoft Visual Basic, Oracle Developer 2000, Visual C++, and Power Builder Today, most large corporate systems still run on COBOL, one of the older programming languages Programmers should have familiarity with DB2, Oracle, Microsoft SQL Server, Microsoft Access, Sybase Adaptive Server, or other database software There are more than one thousand computer languages It is essential that a programmer have a thorough knowledge of the language or languages in which programs are written in the organization where he or she seeks employment Programmers must further possess knowledge of general programming techniques and general relationships between program and hardware features A strong orientation to detail is important in that something as small as a misplaced comma could cause system failure This characteristic becomes crucial as a programmer debugs his or her programs to ensure they are error-free Debugging usually entails making trial runs on the computer with sample data Programs may be written in a matter of hours or may require more than a year of work Thus programmers may work alone on small projects or in teams for larger projects After completion of a program, the programmer must prepare an instruction sheet for the data entry and computer operators who will enter the data into the computer and run the program The work of these operators will be described in 4 There are three types of programmers at work in most organizations: operating systems programmers, applications programmers, and maintenance programmers.

As you saw when you built googlehtml, accessing a web server other than the one your web page is hosted on is a little tricky with Ajax Say your Ajax page is at wwwmyservercom/ hamster_fanhtml, but you want to download the page at wwwtheirservercom/hamster_data html that is, on a different server You can access that page directly in Ajax from your current page, but the browser is going to display a warning dialog box to the user, asking their permission to proceed Not the most ultra-cool thing that can happen The common solution is to communicate with the other server (wwwtheirservercom) via server-side code, and you saw an example of that in googlephp With googlephp, we were able to relay our request to Google Suggest, and then download Google Suggest s response Here s a general PHP script that lets you redirect Ajax requests in this way replace URL with the URL of the web resource you want to reach:

Positive Feedback Feedback can be in phase or out of phase For a circuit to oscillate, the feedback must be in phase (positive) Out-of-phase (negative) feedback reduces the gain of an amplifier In fact, negative feedback is used in some amplifiers to prevent oscillation

< php $filehandle = fopen(URL, "r"); while (!feof($filehandle)){ $download = fgets($filehandle); echo $download; } fclose($filehandle); >

The output of a common emitter or common source amplifier is out of phase from the input If you couple the collector to the base through a capacitor, you won t get oscillation It is necessary to reverse the phase in the feedback process in order for oscillation to occur In addition, the amplifier gain must be high, and the coupling from the output to the input must be good The positive feedback path must be easy for a signal to follow Most oscillators are common emitter or common source amplifier circuits with positive feedback The output of a common base or common gate amplifier is in phase with the input But these circuits have limited gain, and it s hard to make them oscillate Common collector and common drain circuits don t have enough gain to make oscillators

After you get googlehtml and googlephp to work, try the same technique with another server For example, you might download and display the HTML of the USA Today site, www usatodaycom Here s how that would work in a PHP script:

Feedback at a Single Frequency The frequency of an oscillator is controlled by means of tuned, or resonant, circuits These are usually inductance-capacitance (LC ) or resistance-capacitance (RC ) combinations The LC scheme is common in radio transmitters and receivers; the RC method is more often used in audio work The tuned circuit makes the feedback path easy for a signal to follow at one frequency, but hard to follow at all other frequencies As a result, oscillation takes place at a predictable and stable frequency, determined by the inductance and capacitance, or by the resistance and capacitance

< php $filehandle = fopen("wwwusatodaycom", "r"); while (!feof($filehandle)){ $download = fgets($filehandle); echo $download; } fclose($filehandle); >

If you like, you can even change googlephp to download from wwwusatodaycom and use googlehtml as it stands to connect and display the HTML of USA Today s site Now it s time to turn to another topic requesting HTML header info with Ajax

Many circuit arrangements can be used to produce oscillation The following several circuits are all known as variable-frequency oscillators (VFOs), because their frequencies are adjustable over a wide range