IMPLEMENTATION OF CONCEPTS OF OBJECT-ORIENTED PROGRAMMING LANGUAGE IN SIMULA, SMALLTALK,AND C

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｒｅｃｅｎｔｙｅａｒｓ，ａｎｅｗｔｒｅｎｄｈａｓｂｅｎｅｍｅｒｇｉｎｇｉｎｐｒｏｇｒａｍｍｉｎｇｌａｎｇｕａｇｅ．Ｉｔｉｓｃａｌｅｄｏｂｊｅｃｔ＿ｏｒｉｅｎｔｅｄａｐｐｒｏａｃｈ．Ｉｎｔｈｉｓａｐｐｒｏａｃｈａｐｒｏｇｒ...

IMPLEMENTATION OF CONCEPTS OF OBJECT_ORIENTED PROGRAMMING LANGUAGE IN SIMULA, SMALLTALK, AND C

An Object_oriented approach is one of the most promising approaches for the next generation language. Object_oriented programming languages (OOPLs) introduce many new concepts and useful concepts in the field of programming language. In this paper we study three major OOPLs: Simula, Smalltalk, and C . Simula is considered the first OOPL. Simula introduced the concept of objects and classes for the first time. Smalltalk is the first full_fledged OOPL. Refinements of inheritance, subclass, overloading are some of the contribution of Smalltalk to the development of OOPLs. C is the first widely used OOPL, since C is a superset of the C which is a popular programming language. The basic concepts in OOPLs are as follows: objects, classes, subclasses, messages, methods, inheritance, encapsulation, information hiding, and so on. In this paper, we examine these concepts and how these concepts are implemented in Simula , Smalltalk, and C . Then we compare them in terms of object_oriented concepts, and suggest further research.