JAL manual - language - constants

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A constant declaration introduces a name which has a constant value throughout its scope. When the type is omitted the constant has the type universal. A single constant declaration can introduce a number of constants of the same type.

example
   const byte cr = 0x0D, lf = 0x0A        -- byte constants
   const seconds_per_day = 60 * 60 * 24   -- universal integer constant

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