by Joseph Weizenbaum Since the dawn of the age of computers, people have cursed the difficulty of programming. Over and over again we encounter the suggestion that we should be able to communicate to a computer in natural language what we want it to do. Unfortunately, such advice rests upon a misconception of both the computer and its task. The computer might not be stupid, but it is stubborn. That is, the computer does what all the details of its pro gram command it to do, i. e. , what the programmer "tells" it to do. And this can be quite different from what the programmer intended. The misun derstanding with respect to tasks posed to the computer arises from the failure to recognize that such tasks can scarcely be expressed in natural language, if indeed at all. For example, can we practice music, chemistry or mathematics without their respective special symbolic languages? Yet books about computers and programming languages can be written more or less reasonably, even if they are not quite poetic or lyrical. This book can serve as an example of this art and as a model for anyone at tempting to teach inherently difficult subject matters to others. Klagenfurt, April 1995 Preface Striving to make learning to program easier, this book addresses primarily students beginning a computer science major. For our program examples, we employ a new, elegant programming language, Modula-3.

This book aims to provide a complete guide for programmers who want to learn how to write correct and maintainable programmes in the Modula-3 programming language - the newest member of the Pascal family of languages. The book describes the complete Modula-3 language, beginning with basics and progressing to more advanced features of the language. Coverage includes the basic language, declaration statements, types and procedures.

This book constitutes the refereed proceedings of the international Joint Modular Languages Conference, JMLC 2003, held in Klagenfurt, Austria in August 2003. The 17 revised full papers and 10 revised short papers presented together with 5 invited contributions were carefully reviewed and selected from 47 submissions. The papers are organized in topical sections on architectural concepts and education, component architectures, language concepts, frameworks and design principles, compilers and tools, and formal aspects and reflective programming.

This book constitutes the refereed proceedings of the international Joint Modular Languages Conference, JMLC 2006. The 23 revised full papers presented together with 2 invited lectures were carefully reviewed and selected from 36 submissions. The papers are organized in topical sections on languages, implementation and linking, formal and modelling, concurrency, components, performance, and case studies.

This book constitutes the refereed proceedings of the international Joint Modular Languages Conference, JMLC 2006. The 23 revised full papers presented together with 2 invited lectures were carefully reviewed and selected from 36 submissions. The papers are organized in topical sections on languages, implementation and linking, formal and modelling, concurrency, components, performance, and case studies.

Software is difficult to develop, maintain, and reuse. Two factors that contribute to this difficulty are the lack of modular design and good program documentation. The first makes software changes more difficult to implement. The second makes programs more difficult to understand and to maintain. Formal Specification Techniques for Engineering Modular C Programs describes a novel approach to promoting program modularity. The book presents a formal specification language that promotes software modularity through the use of abstract data types, even though the underlying programming language may not have such support. This language is structured to allow useful information to be extracted from a specification, which is then used to perform consistency checks between the specification and its implementation. Formal Specification Techniques for Engineering Modular C Programs also describes a specification-driven, software re-engineering process model for improving existing programs. The aim of this process is to make existing programs easier to maintain and reuse while keeping their essential functionalities unchanged. Audience: Suitable as a secondary text for graduate level courses in software engineering, and as a reference for researchers and practitioners in industry.

This book grew out of three series of lectures given at the summer school on "Modular Forms and their Applications" at the Sophus Lie Conference Center in Nordfjordeid in June 2004. The first series treats the classical one-variable theory of elliptic modular forms. The second series presents the theory of Hilbert modular forms in two variables and Hilbert modular surfaces. The third series gives an introduction to Siegel modular forms and discusses a conjecture by Harder. It also contains Harder's original manuscript with the conjecture. Each part treats a number of beautiful applications.

Software systems play an increasingly important role in modern societies. Smart cards for personal identi?cation, e-banking, software-controlled me- cal tools, airbags in cars, and autopilots for aircraft control are only some examples that illustrate how everyday life depends on the good behavior of software. Consequently, techniques and methods for the development of hi- quality, dependable software systems are a central research topic in computer science. A fundamental approach to this area is to use formal speci?cation and veri?cation. Speci?cation languages allow one to describe the crucial p- perties of software systems in an abstract, mathematically precise, and implementation-independent way. By formal veri?cation, one can then prove that an implementation really has the desired, speci?ed properties. Although this formal methods approach has been a research topic for more than 30 years, its practical success is still restricted to domains in which devel- ment costs are of minor importance. Two aspects are crucial to widen the application area of formal methods: – Formal speci?cation techniques have to be smoothly integrated into the software and program development process. – The techniques have to be applicable to reusable software components. This way, the quality gain can be exploited for more than one system, thereby justifying the higher development costs. Starting from these considerations, Peter Muller ̈ has developed new te- niques for the formal speci?cation and veri?cation of object-oriented so- ware. The speci?cation techniques are declarative and implementati- independent. They can be used for object-oriented design and programming.