The if processing code is used in dictionary attributes 7 and 8 (conversion and correlative) to generate values based on results of evaluation of expression according to the rules of a-correlative construction.
The if processing code is a stand-alone version of the if conditional allowable within an a-correlative. If the condition evaluates to true (nonzero) the a-correlative following then is executed. If there is no then clause a null value is returned on true.
If the condition evaluates to 0 (false), the else clause is taken. Multiple complex conditionals can be constructed by using end to close the current if clause and associate else with the prior if clause.
| System Processors | Select, Update, List |
| Code Type | Attribute Defining |
| Dictionary Attributes | Input Conversion, Output Conversion, Correlative |
if condition{then a-correlative} {else a-correlative} {end}
if 2#4 then 4:’**’:2
if 14["1","3"]=’sco’ then 17