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IF output values—Data extract expressions
The most common use for the IF statement is in determining which of two values should be copied to the output record depending upon which of the two clauses is executed: the THEN or the ELSE.
If the expression in the executed clause is simply a field name or segment name (including any cast specification), the specified value is copied to the output record. If the executed clause contains an arithmetic or relational expression, the expression will be evaluated and that result will be copied to the output record.
