The paper focuses on the most frequent mistakes in object oriented programming (OOP) of common programming processes. It also focuses on the mistakes made in creating object models. The target of OOP is to create a purposeful program which implements all the requirements of a given assignment and which is resistant to usage variations. The first condition to fulfill given aim is a good application proposal. The second condition is working knowledge of programming languages and the last one is knowledge of the settings at which program works. The article deals with programmer mistakes in relation to the influence of a program's functionality. The fundamental mistakes, made in program application execution, are syntax errors. Other mistakes are those which do not shape the program functionality. These arise during the program's structural development. These types of mistakes, in many cases, are not recognized by programmers, because the program appears to work properly. These mistakes, however, are fundamental, because of cooperation in program-creating team. This paper is aimed towards both; beginner programmers as well as experienced workers, and it can help them to identify bad habits which influence team work. Successful programming requires practical experience, but this script enables programmers to obtain accelerated practical experience in computer programming.
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