Using REXX with QMF forms
Expressions used in FORM.CALC, FORM.CONDITIONS, and FORM.COLUMNS (Column Definition) can consist of terms (strings, symbols, and functions) interspersed with operators and parentheses. Do not execute QMF™ commands (using the callable or command interfaces) from within a REXX expression or program.
- Strings
- Literal constants enclosed in single or double quotation marks. For example, 'High' and "Low".
- Symbols
- Numeric literals (numbers), variables, or nonnumeric literals
without quotation marks:
- Numeric literals can be expressed in integer, decimal,
or exponential notation. For example:
123
25.45
.432
1.7E4 (equivalent to 17000)
7.6e-3 (equivalent to .0076)Commas are not allowed, except as decimal points. (QMF allows commas for decimal points only when they are defined as such to the database manager.)
- Variables are restricted by how the expression is used.
- Nonnumeric literals are symbols that are neither numbers nor variables. These are handled like strings in the evaluation of expressions.
- Numeric literals can be expressed in integer, decimal,
or exponential notation. For example:
- Functions
- Functions have the following syntax:
In this syntax, 0 to n expression arguments can exist (where n is the maximum number of comma-separated expressions allowed by REXX).function-name([[expression][,][expression][,] ...])In the above syntax, function-name must identify either a built-in function or an external function (for example, a REXX program). Evaluation of an expression is left to right, modified by parentheses and by operator precedence in the usual algebraic manner (with the exception of the minus prefix). The expression must be 1000 or fewer bytes, including variable values.