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Constants

PRISM supports the use of constants, as seen in Example 2. Constants can be integers, doubles or Booleans and can be defined using literal values or as constant expressions (including in terms of each other) using the const keyword. For example:

const int radius = 12;

const double pi = 3.141592;

const double area = pi * radius * radius;

const bool yes = true;

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The identifiers used for their names are subject to the same rules as variables.

Constants can be used anywhere that a constant value would be expected, such as the lower or upper range of a variable (e.g. N in Example 2), the probability or rate associated with an update (mu in Example 2), or anywhere in a guard or update. As will be described later constants can also be left undefined and specified later, either to a single value or a range of values, using experiments.

Note: For the sake of backward-compatibility, the notation used in earlier versions of PRISM (const for const int and rate or prob for const double) is still supported.

Constants

PRISM Manual