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In addition to WHILE, REPEAT and FOR constructs Modula 2 has another iteration construct…LOOP. Multiple exits are possible using a command EXIT which may be conditionally selected. Use of the LOOP construct is not recommended for the inexperienced programmer! Partitions Software partitions are the strength of Modula 2! Procedures and modules are fully supported. Functions are not quite the same as in other languages. 1. PROJECTS 45 return structured data objects. The effect of this can be simulated by using a reference parameter (although it will lead to less readable source code) or by returning a pointer to the structured data.

Question four i Describe an example, of your own, of a process where some of the subordinate processes run concurrently. Having done that, now describe an example where all the subordinate processes run successively. ii A process is composed of four subordinate processes, A, B, C, D. The following communication paths must exist… • • • • AΣ BΣ CΣ CΣ B (asynchronous) D (synchronous) D (asynchronous) A (synchronous) Two processors are available, which do not share memory but which possess physical (hardware) communication channels (one input and one output channel each).

Neither may they contain any nondeterminacy in the form of ALT or PAR constructs. Neither procedures nor functions may be recursively defined. This constitutes a third weakness in that it places a limit on its expressivity, especially for mathematical applications. Applicability Concurrent functions or procedures cannot share variables and thus cannot inflict side effects upon each other. A newcomer to Occam might well start off with the notion of it as “Pascal with no shared variables”. The idea of doing away with the sharing of any state between processes is central and responsible for Occam being able to offer simple yet unrestricted access to the power of parallel processing.

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