VBScript Reference Manual for InduSoft Web Studio

VBScript Reference Manual InduSoft Web Studio
Atn
Description Returns the arctangent of a number
Usage realRslt = Atn(number)
Arguments number
The number argument can be any valid numeric expression.
Return Returns the arctangent of a number as Variant subtype Double. Result is in radians.
Remarks The Atn function takes the ratio of two sides of a right triangle (number) and returns the
corresponding angle in radians. The ratio is the length of the side opposite the angle divided by
the length of the side adjacent to the angle. The range of the result is -pi /2 to pi/2 radians. To
convert degrees to radians, multiply degrees by pi/180. To convert radians to degrees, multiply
radians by 180/pi.
Note: Atn is the inverse trigonometric function of Tan, which takes an angle as its argument and
returns the ratio of two sides of a right triangle. Atn is not to be confused with the cotangent,
which is the simple inverse of a tangent (1/tangent).
See also Cos, Sin, and Tan
Example Dim pi
pi = 4 * Atn(1) ' Calculate the value of pi.
CBool
Description Returns an expression that has been converted to a Variant of subtype Boolean
Usage boolRslt = CBool(expression)
Arguments expression
Any valid expression
Return Boolean value corresponding to the value of the expression
Remarks If the expression is zero, False is returned; otherwise True is returned. If the expression cannot
be interpreted as a numeric value, a run-time error occurs.
See also CByte, CCur, CDbl, CInt, CLng, CSng, CStr
Example Dim A, B, Check
A = 5
B= 5
Check = CBool (A = B) ‘ Check contains True
A= 0
Check = CBool (A) ‘ Check contains False
CByte
Description Returns an expression that has been converted to a Variant of subtype Byte
Usage byteVal = CByte (expression)
Arguments expression
The expression argument is any valid numeric expression
Return An expression converted to a Byte value
Remarks A runtime error occurs if expression can’t be evaluated to a numeric value. If expression lies
outside the acceptable range for the byte subtype (0-255), an Overflow error occurs. If expression
is a floating point number, it is rounded to the nearest integer and then converted to byte subtype.
Use the CByte function to provide internationally aware conversions from any other data type to a
Byte subtype. For example, different decimal separators are properly recognized depending on
the locale setting of your system, as are different thousand separators.
See also CBool, CCur, CDbl, CInt, CLng, CSng, CStr
Example Dim myDouble, myByte
myDouble = 123.45678
myByte = CByte(myDouble) ‘ myByte contains 123
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