To increment and output the value of a variable as a number use the syntax:

$++variableName

To first output and then increment the value of a variable, use the syntax:

$variableName++

The value of a variable may also be decremented by using “--“ in place of “++” in the above examples. Note that if the variable value is not a number it will be interpreted as 0 for the increment or decrement operation. For non-integer values and numbers in scientific format, the operations add or subtract 1 without rounding, returning a float representation.

If you do not want the result output, you can add a string translation to it to map all characters (or just all digits) to nothing. The translator would normally be defined just once at the start of the outermost generator, but we include it inline here for completeness:

to '%null' newline '* $' endto
$variableName++%null

More complex calculations with variables can be done by using the math..evaluate clause.