Condition that an Electron Describe a Geodesic by Bramley A.

By Bramley A.

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The virtual machine can be designed in such a way that treatment of specific, machine­dependent details can be deferred until it is necessary to translate the implementation of the virtual machine to a real one.  Unlike the SNOBOL4 virtual machine (Griswold 1972), it is incomplete and characterizes only the expression­evaluation mechanism of Icon and computations on Icon data.  Instead Icon's virtual machine serves more as a guide and a tool for organizing the implementation than it does as a rigid structure that dominates the implementation.

1 The Icon Virtual Machine The implementation of Icon is organized around a virtual machine (Newey, Poole, and Waite 1972; Griswold 1977).  A virtual machine also provides a basis for developing an operational definition of a programming language in which details can be worked out in concrete terms.  The virtual machine can be designed in such a way that treatment of specific, machine­dependent details can be deferred until it is necessary to translate the implementation of the virtual machine to a real one.

Consequently, scanning expressions can be nested.  The value of *cities is 3, for example.  For example, sort(cities) produces ["Miami", "Portland", "Toledo"] List operations, unlike string operations, are not applicative. While assignment to a substring is an abbreviation for concatenation, assignment to a subscripted list changes the value of the subscripted element.  Because of this, states[2] := "Arkansas" changes the second element of slist as well as the second element of states.  Elements can be added to them or removed from them at their ends by queue and stack functions.

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