Enform Plus Reference Manual

Enform Plus Language Elements

Enform Plus Reference Manual—422684-001

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Pattern-Match in Logical Expressions

In a logical expression, a field described as alphanumeric in the data dictionary can be

compared to a pattern-match. A pattern-match is actually a comparison template that the

field value is compared to. In the following logical expression, the partname field is

compared to a pattern-match:

partname = [-"DISK" - "MB"-],

OR partname = [-"DISK"-"Mb"-],

OR partname = [-"Disk"-"MB"-],

OR partname = [-"Disk"-"Mb"-],

In the following logical expression, two numbers precede the string-literal,

indicating that at least one character but no more than two characters must precede

string-literal in the field value:

partname EQ [1,2 "T"-],

IF/THEN/ELSE Expressions

IF/THEN/ELSE expressions yield a value determined by the result of a logical

expression. IF/THEN/ELSE expressions can be used wherever an arithmetic

expression can be used. IF/THEN/ELSE expressions can be nested. The syntax of an

IF/THEN/ELSE expression is as follows:

logical-expression

is a logical expression that evaluates as true or false.

value-1 or value-2

is a field name, an arithmetic expression, or IF/THEN/ELSE expression, or one of

the following value keywords: NULL, BLANK, BLANKS, ZERO, ZEROS.

If the logical expression is evaluated as true, value-1 is used. If the logical expression is

evaluated as false, value-2 is used. Value-1 and value-2 must be the same data type,

either both numeric or both alphanumeric.

The value keywords NULL, BLANK, and BLANKS print blanks on reports. The value

keywords ZERO and ZEROS print zeros on reports.

Consider the following IF/THEN/ELSE expression:

IF partnum = 2001 THEN ZEROS ELSE partnum,

This expression specifies that if partnum is equal to 2001, then zeros are to be printed

on the report. If partnum has any other value except 2001, the value of partnum is

printed.

(IF logical-expression THEN value-1 ELSE value-2)