VBScript Reference Manual for InduSoft Web Studio

InduSoft Web Studio VBScript Reference Manual
Subtraction Operator (-)
Description Finds the difference between two numbers or indicates the negative value of a numeric
expression.
Usage result = number1 - number2 (Syntax 1)
result = - number (Syntax 2)
Arguments result
Any numeric variable.
number1
Any valid numeric expression.
number2
Any valid numeric expression.
number
Any valid numeric value or numeric expression
Remarks In Syntax 1, the - operator is the arithmetic subtraction operator used to find the difference
between two numbers. In Syntax 2, the - operator is used as the unary negation operator to
indicate the negative value of an expression. If one or both expressions are Null expressions,
result is Null. If an expression is Empty, it is treated as if it were 0.
Example: MyResult = 5 - 4 ' MyResult is 1
a = 5
MyResult = -a ‘ MyResult is -5
MyResult = -(5-4) ‘ MyResult is -1
Xor Operator (Xor)
Description Performs a logical exclusion on two expressions.
Usage result = expression1 Xor expression2
Arguments result
Any variable.
expression1
Any valid expression.
expression2
Any valid expression.
Remarks If one, and only one, of the expressions evaluates to True, result is True. However, if either
expression is Null, result is also Null. When neither expression is Null, result is determined
according to the following table:
If expression1 is And expression2 is Then result is
True True False
True False True
False True True
False False False
The Xor operator also performs a bitwise comparison of identically positioned bits in two numeric
expressions and sets the corresponding bit in result according to the following table:
If bit in expression1 is And bit in expression2 is Then result is
0 0 0
0 1 1
1 0 1
1 1 0
See also And Operator, Not Operator, Or Operator
Example: Dim cond1, cond2, flag
cond1 = True
cond2 = False
If (cond1 = True) Xor (cond2 = True) Then
flag = True
Else
flag = False
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