BitTest ( value ; bit )
Checks if bitnumber 'bit' in value 'value' is on or off
Average rating: 4.2 (37 votes) Log in to vote
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Theo Ros - Show more from this author |
Sample input:
BitTest ( 33 , 5 )
Sample output:
True
Function definition: (Copy & paste into FileMaker's Edit Custom Function window)
Checks if bitnumber 'bit' in value 'value' is on or off
The first bitnumber in a value is 0
For a value = 1, bitnumber 0 is ON
For a value = 2, bitnumber 0 = OFF, bitnumber 1 = ON
Syntax: BitTest ( value ; bit )
Returns True (1) if the bit is ON, False (0) if not.
Return type: Number (boolean)
This function is a vital part of the BitSet(), BitClear() and BitChange() functions.
Comments
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Leland Long, Charleston, SC, USA Apr 1, 2014 |
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| Appears to fail after at least 4 bits. Here's a test to see the failure: Let ( [ binary = "01101101" ; bit0 = BitTest ( binary ; 0 ) ; bit1 = BitTest ( binary ; 1 ) ; bit2 = BitTest ( binary ; 2 ) ; bit3 = BitTest ( binary ; 3 ) ; bit4 = BitTest ( binary ; 4 ) ; bit5 = BitTest ( binary ; 5 ) ; bit6 = BitTest ( binary ; 6 ) ; bit7 = BitTest ( binary ; 7 ) ; bit8 = BitTest ( binary ; 8 ) ] ; bit8 & bit7 & bit6 & bit5 & bit4 & bit3 & bit2 & bit1 & bit0 ) This results in: 100101101 |
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Leland Long, Charleston, SC, USA Apr 1, 2014 |
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| Wow! I need more coffee….. I see now that the input is assuming a decimal number, not a binary number or string. False alarm! |
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Theo Ros, Hilversum, The Netherlands Apr 1, 2014 |
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| Yes, the 'value' parameter is meant to be a decimal number. Sorry i have not made that clearer in the description. Cheers, Theo |
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