VMS Help PASCAL, Expressions  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Compaq Pascal expressions consist of one or more  operands  that
  result  in a single value.  If the expression contains more than
  one operand, the operands are separated by operators.   Operands
  include  numbers,  strings,  constants,  variables, and function
  designators.  Operators include arithmetic, relational, logical,
  string, set, and typecase operators.

  Compaq Pascal recognizes two  forms  of  expressions:   constant
  expressions  and  run-time  expressions.   Constant  expressions
  result in a value at the time you compile your  program.   These
  expressions   can   include   constants,  constant  identifiers,
  operators, and some predeclared functions.  Run-time expressions
  can only result in a value at the time you execute your program.
  These expressions can include variables, predeclared  functions,
  user-declared   functions,   and   everything  that  a  constant
  expression cannot contain.

  See  the  "Compaq  Pascal   Language   Reference   Manual"   for
  restrictions   on   constant   expressions  and  information  on
  evaluation of expressions in statements.

  Syntax:

    simple-expression [[ {<> | < | <= | = | > | >= | IN}
    simple-expression ]]

  Additional Information (explode) :

• simple_expression
• term
• primary
• factor
• Examples
• Operators