IsPowerOfTwo ( number )

Returns True(1) if number is a power of two; otherwise returns False(0).

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Michael Horak - Show more from this author
*COMMENT Visual Realisation

Sample input:

IsPowerOfTwo ( 0 )
IsPowerOfTwo ( 1 )
IsPowerOfTwo ( 2 )
IsPowerOfTwo ( 3 )
IsPowerOfTwo ( 4 )
IsPowerOfTwo ( 5 )
...
IsPowerOfTwo ( 1023 )
IsPowerOfTwo ( 1024 )
IsPowerOfTwo ( 1025 )

Sample output:

0
1
1
0
1
0
...
0
1
0

Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

/*
IsPowerOfTwo function

Author
*COMMENT Visual Realisation

Format
IsPowerOfTwo ( number )

Parameters
number - any numeric expression or field containing a numeric expression, expressed as an integer

Data type returned
number

Description
Returns True(1) if number is a power of two; otherwise returns False(0).


June 2, 2006
*/


Let ( [
bit = Mod ( number ; 2 ) ;
next = Div ( number ; 2 ) 
] ;
Case ( 
not bit and next ; IsPowerOfTwo ( next ) ;
bit and not next
)
)

A recursive function to determine if number is a power of two. Returns True(1) if number is a power of two; otherwise returns False(0).

A power of two is 2 multiplied by itself any number of times. Note that 1 is a power of two, since 2^0=1.

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Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

IsPowerOfTwo ( number )

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