powerof2 - Online Linux Manual PageSection : 3
Updated : 2022-12-31
Source : Linux man-pages 6.03

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NAMEpowerof2 − test if a value is a power of 2

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LIBRARYStandard C library (libc)

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SYNOPSIS#include <sys/param.h>int powerof2(x);

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DESCRIPTIONThis macro returns true if x is a power of 2, and false otherwise. 0 is considered a power of 2. This can make sense considering wrapping of unsigned integers, and has interesting properties.

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RETURN VALUETrue or false, if x is a power of 2 or not, respectively.

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STANDARDSThis nonstandard macro is present in glibc and the BSDs.

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CAVEATSThe arguments may be evaluated more than once. Because this macro is implemented using bitwise operations, some negative values can invoke undefined behavior. For example, the following invokes undefined behavior: powerof2(INT_MIN);. Call it only with unsigned types to be safe.

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SEE ALSOstdc_bit_ceil(3), stdc_bit_floor(3) 0

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