Relational Operators
Relational operators work with all data types and return a Logical value.
The following table lists the relational operators.
Relational
Operators
|
Operator |
Action |
Code |
<
|
Less than |
? 23 < 54
|
>
|
Greater than |
? 1 > 2
|
=
|
Equal to |
? cVar1 = cVar
|
<>, #, !=
|
Not equal to |
? .T. <> .F.
|
<=
|
Less than or
equal to |
? {^1998/02/16} <= {^1998/02/16}
|
>=
|
Greater than
or equal to |
? 32 >= nHisAge
|
==
|
Character
string comparison |
? status == "Open"
|
The
== operator can be used when an exact comparison of character strings is
needed. If two character expressions are compared with the == operator, the
expressions on both sides of the == operator must contain exactly the same
characters, including blanks, to be considered equal. The SET EXACT setting
is ignored when character strings are compared using ==. See SET EXACT for
more information on using the == operator to compare character strings.
You
can also use the equal to (=) operator in Visual FoxPro 6.0 to determine if
two object references refer to the same object. The following example
demonstrates a simple usage:
CLEAR ALL
X = CREATEOBJECT('Form')
Y = CREATEOBJECT('Form')
? X = Y && Displays false (.F.)
Z = X
? X = Z && Displays true (.T.)
|
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