Basic expressions

You can use the following items in an expression:

• Parameters

  A parameter in an expression is replaced by the value of the parameter.

• Constants

  A constant in an expression is replaced by the value of the constant.

• Variables

  A variable in an expression is replaced by the current value of the variable.

• Strings

  A string is a sequence of characters between quotes. Use "" to insert a single " in the string.

• Numbers

  A number can be written in one of the following notations: Decimal: as a sequence of digits. Hexadecimal: as a sequence of hexadecimal digits (0-9, a-f), prefixed with "0x." Example The number 42 is written as 42 in decimal or 0x2a in hexadecimal.

• Booleans

  You can use Boolean values in expressions where a conditional value is expected. The Boolean values are True and False.

• Parentheses

  You can enclose any expression in parentheses to affect the order of evaluation.