Annotation, recursion and repetition

Abstract

This chapter is devoted to the introduction of annotations, procedures, recursion and repetitions, all concepts highly relevant to programming practice and programming methodology. In 2.1 we introduce Hoare triples as a specification method. Hoare triples are used in 2.2 for correctness proofs by annotation. In 2.3 and 2.4 we treat procedures in a programming language like Pascal. The specification and invocation rules are discussed in Section 2.3. The correctness of recursive procedures is treated in Section 2.4. The methods presented here are not new but deserve to be promoted.