Object-oriented programmin gis a modern method for software development. The basic reason of rapid proftware technique, which is now taking place, is a tendency for reaching better efficiency and clarity of computer software while assuring higher data security. Each new defined type of data became related to the procedures which only are authorised to the change of their values. Such a combination of data and procedures which operate on them, forms in object-oriented programming languages the type of data called objects. Increase in efficiency in comparison with the structural programming is effected also by the so called inheritance~1-4.
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