A computer program (called computer program) - a string of symbols describing the calculations in accordance with valid rules, called a programming language [1]. The program is usually executed next to a computer (recompense model, displays the trap number), every so often directly - if it is expressed in a words understandable as the machinery or indirectly - if it is interpreted by means of another program (the interpreter). The program can be a course of instructions that describe the modifications of the machine but it can also outline the figure in another modus operandi (eg, lambda calculus).
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The formal appearance of the estimate method in the form of human lingo understandable to the begetter code is called when the program expressed in machine-readable (that is, past the numbers, and more veracious ones and zeros) is called machine jurisprudence or binary form (executable).
Computer programs can be classified according to their applications. So distinguished before user applications, operating systems, video games, compilers, and others. Programs embedded backwards the device is referred to as firmware.