BitValueString (String function)

Get bit value (0 or 1) in a string (String class)

[Introduced in Model 204 7.5]

This function returns the "value" of a bit in a string: 0 if the requested bit number is off, 1 if it is on.

Syntax

%value = string:BitValueString( bitNumber) Throws InvalidBitNumber

Syntax terms

%value	Set to 0 if the requested but number was off, and 1 if it was on.
string	The string for which a bit is to be tested.
bitNumber	The bit number in the input string that is to be tested. Note that this is a bit number not a bit offset. So the first bit in the string is bit number 1.

Usage notes

• Requesting a non-positive bit number, or a bit number past the the end of the string results in an InvalidBitNumber exception being thrown.
• Since each byte in a string has 8 bits, the valid bit numbers range from 1 to the length of the string times 8. So a null (zero-length) string has no valid bits.

Examples

The following example a bit in a string being tested based on a field value:

%bitmap is string len 32 ... for record %record if %bitmap:bitValueString(stateCode) eq 0 then ... retrieve information for state %bitmap:bitSetString(statecode) end if end for

See also

BitAndString BitOffString BitOnString BitOrString BitXorString

BitClearString, BitFlipString, and BitSetString BitCountString

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