Expressions

 VSI 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.

 VSI  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 "HP 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 available:

simple_expression               term            primary         factor
Examples        Operators