Bit manipulation (since C23)

 

C

Compiler support

Language

Headers

Type support

Program utilities

Variadic function support

Error handling

Dynamic memory management

Strings library

Algorithms

Numerics

Date and time utilities

Input/output support

Localization support

Concurrency support (C11)

Technical Specifications

Symbol index

 

Numerics

Common mathematical functions

Floating-point environment (C99)

Pseudo-random number generation

Complex number arithmetic (C99)

Type-generic math (C99)

Bit manipulation (C23)

Checked integer arithmetic (C23)

 

Bit manipulation

Functions

stdc_leading_zeros (C23)

stdc_leading_ones (C23)

stdc_trailing_zeros (C23)

stdc_trailing_ones (C23)

stdc_first_leading_zero (C23)

stdc_first_leading_one (C23)

stdc_first_trailing_zero (C23)

stdc_first_trailing_one (C23)

stdc_count_zeros (C23)

stdc_count_ones (C23)

stdc_has_single_bit (C23)

stdc_bit_width (C23)

stdc_bit_floor (C23)

stdc_bit_ceil (C23)

Macro constants

__STDC_ENDIAN_LITTLE__ __STDC_ENDIAN_BIG__ __STDC_ENDIAN_NATIVE__ (C23)(C23)(C23)

 

Functions
Defined in header <stdbit.h>
stdc_leading_zeros (C23)	counts the number of consecutive ​0​ bits, starting from the most significant bit (type-generic function macro)
stdc_leading_ones (C23)	counts the number of consecutive 1 bits, starting from the most significant bit (type-generic function macro)
stdc_trailing_zeros (C23)	counts the number of consecutive ​0​ bits, starting from the least significant bit (type-generic function macro)
stdc_trailing_ones (C23)	counts the number of consecutive 1 bits, starting from the least significant bit (type-generic function macro)
stdc_first_leading_zero (C23)	finds the first position of ​0​ bit, starting from the most significant bit (type-generic function macro)
stdc_first_leading_one (C23)	finds the first position of 1 bit, starting from the most significant bit (type-generic function macro)
stdc_first_trailing_zero (C23)	finds the first position of ​0​ bit, starting from the least significant bit (type-generic function macro)
stdc_first_trailing_one (C23)	finds the first position of 1 bit, starting from the least significant bit (type-generic function macro)
stdc_count_zeros (C23)	counts the number of ​0​ bits in an unsigned integer (type-generic function macro)
stdc_count_ones (C23)	counts the number of 1 bits in an unsigned integer (type-generic function macro)
stdc_has_single_bit (C23)	checks if a number is an integral power of 2 (type-generic function macro)
stdc_bit_width (C23)	finds the smallest number of bits needed to represent the given value (type-generic function macro)
stdc_bit_floor (C23)	finds the largest integral power of 2 not greater than the given value (type-generic function macro)
stdc_bit_ceil (C23)	finds the smallest integral power of 2 not less than the given value (type-generic function macro)
Macro constants
Defined in header <stdbit.h>
__STDC_ENDIAN_LITTLE____STDC_ENDIAN_BIG__ __STDC_ENDIAN_NATIVE__ (C23)	indicates the endianness of scalar types (macro constant)

References

• C23 standard (ISO/IEC 9899:2024):

• 7.18 Bit and byte utilities <stdbit.h>

See also

C++ documentation for Bit manipulation

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