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used computer gamesProgramsIn practical terms, a computer program might include anywhere from a dozen instructions to many millions of instructions for something like a word processor or a web browser. A typical modern computer can execute billions of instructions every second and nearly never make a mistake over years of operation. Large computer programs may take teams of computer programmers years to write and the probability of the entire program having been written completely in the manner intended is unlikely. Errors in computer programs are called bugs. Sometimes bugs are benign and do not affect the usefulness of the program, in other cases they might cause the program to completely fail (crash), in yet other cases there may be subtle problems. Sometimes otherwise benign bugs may be used for malicious intent, creating a security exploit. Bugs are usually not the fault of the computer. Since computers merely execute the instructions they are given, bugs are nearly always the result of programmer error or an oversight made in the program's design. computer donation computer donation computers computer recycle computer recycle refurbished PC Abi Titmuss nationwide used computer nationwide used computer laptop computers computer recycling nationwide computer recycling nationwide refurbished pc Adriana Lima nationwide used computer nationwide used computer notebooks high tech recycle high tech recycle refurbished notebooks Ali Landry used Cisco forum used Cisco forum recycling hi tech recycle hi tech recycle recycling equipment Ali Larter used Cisco router used Cisco router recycle recycling computer recycling computer recycling computers Amy Smart used foundry networks used foundry networks desktop computers sell my computer sell my computer recycling centers Angelina Jolie used juniper equipment used juniper equipment computer laptops sell my laptop sell my laptop recycling center Angie Harmon used network equipment used network equipment buy computer sell your lap top sell your lap top recycling Anna Kournikova used network hardware used network hardware laptop computer surplus computer surplus computer recycle symbol Antonella Barba used network hardware used network hardware computer monitors used Cisco buyer used Cisco buyer recycle monitor Ashley Judd used phones used phones notebook computers used computer recycling used computer recycling recycle electronics Beyonce Knowles used sun systems used sun systems liquidators good easy street liquidation recycle computers best Knowles used surplus computers used surplus computers liquidation go green lets go recycle center Brittany good used test equipment used test equipment recycling centers green computers liquidation furniture recycle cell phones Brittany Murphy In most computers, individual instructions are stored as machine code with each instruction being given a unique number (its operation code or opcode for short). The command to add two numbers together would have one opcode, the command to multiply them would have a different opcode and so on. The simplest computers are able to perform any of a handful of different instructions, the more complex computers have several hundred to choose from—each with a unique numerical code. Since the computer's memory is able to store numbers, it can also store the instruction codes. This leads to the important fact that entire programs (which are just lists of instructions) can be represented as lists of numbers and can themselves be manipulated inside the computer just as if they were numeric data. The fundamental concept of storing programs in the computer's memory alongside the data they operate on is the crux of the von Neumann, or stored program, architecture. In some cases, a computer might store some or all of its program in memory that is kept separate from the data it operates on. This is called the Harvard architecture after the Harvard Mark I computer. Modern von Neumann computers display some traits of the Harvard architecture in their designs, such as in CPU caches. Programs |
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