The Composition of Semantics in Algol 68 The main features of Algol 68 are explained from a semantic point of view. It is shown how the language permits the composition of values and actions, i.e. ultimately programs, from a minimum set of primitives with a few fundamental recursive rules of composition. The associated syntax is briefly reviewed. An attempt has been made to obtain a structured and simple introduction to both Algol 68 and its orthogonal design. CACM November, 1971 Branquart, P. Lewi, J. Sintzoff, M. Wodon, P. L. programming primitives, programming languages, Algol, semantics, recursive composition, design of programming languages, data structures 1.3 4.2 4.22 5.23 5.24 CA711101 JB February 2, 1978 11:49 AM 2148 5 2148 2148 5 2148 2148 5 2148 2314 5 2148 2317 5 2148 2842 5 2148 1098 6 2148 1198 6 2148 1572 6 2148 1626 6 2148 1693 6 2148 1749 6 2148 1753 6 2148 1781 6 2148 210 6 2148 2060 6 2148 2082 6 2148 2126 6 2148 2148 6 2148 2148 6 2148 2148 6 2148 2192 6 2148 3184 6 2148