The `FUZZYCOMPARE` object can be used to state fuzzy constraints
of the following format:

` FUZZYCOMPARE` FuzzyVar1

where FuzzyVar1 and FuzzyVar2 are `FUZZYVAR` objects. CompareOp
is a compare operator out of a user-definable set of operators.
In most cases these would be {=, #, <, >}. Expr* *is
a regular expression as defined in section 7.4. A brief example
shows the use of `FUZZYCOMPARE`:

`/* declaration of FUZZYVAR objects and their PARAMETERSET
objects */`

**FUZZYVAR** fuzzy_variable1 parameterset1

**FUZZYVAR** fuzzy_variable2 parameterset1

**FUZZYVAR** fuzzy_constraint parameterset2

`/* give the variables values */`

**LET** crisp_variable = 5

**SET** fuzzy_variable1 = 20

**SET** fuzzy_variable2 = 0

`/* define and evaluate some constraints */`

**FUZZYCOMPARE** fuzzy_constraint **IS** fuzzy_variable1
= 10

**EVAL** fuzzy_constraint

**FUZZYCOMPARE** fuzzy_constraint **IS** fuzzy_variable1
# fuzzy_variable2

**EVAL** fuzzy_constraint

**FUZZYCOMPARE** fuzzy_constraint **IS** fuzzy_variable1
< SQR(crisp_variable)

**EVAL** fuzzy_constraint

**FUZZYCOMPARE** fuzzy_constraint **IS** fuzzy_variable1
> crisp_variable

**EVAL** fuzzy_constraint

A `FUZZYCOMPARE` constraint compares a fuzzy variable `FUZZYVAR`
`fuzzy_variable` to a crisp value. What the compare operators
are and how single linguistic terms correspond to other when such
comparison is done, has to be described in a `TABLE` file
explicitly. This makes sure that the system is open to extensions
by the user. The format of such `TABLE` files can be found
in section 7.5.7. Whenever such a constraint is encountered, CSI(C&F)
generates automatically the appropriate rules using the table
of correspondings as defined in `TABLE`. So the programmer
has to take care about defining the right `TABLE` before
the use of `FUZZYCOMPARE`.