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Manual Reference Pages  - poppar (3)

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NAME

poppar(3f) - [FORTRAN:INTRINSIC:BIT INQUIRY] Parity of the number of bits set

SYNTAX

result = poppar(i)

DESCRIPTION

Returns the parity of an integer’s binary representation (i.e., the parity of the number of bits set).

ARGUMENTS

I	Shall be of type INTEGER.

RETURN VALUE

The return value is of type ’integer’ and of the default integer kind. It is equal to 0 if I has an even number of bits set and 1 if an odd number of bits are set.

EXAMPLE

Sample program:

   program demo_popcnt
   use, intrinsic :: iso_fortran_env, only : integer_kinds, &
   & int8, int16, int32, int64
   implicit none
      print  *,  popcnt(127),            poppar(127)
      print  *,  popcnt(huge(0_int8)),   poppar(huge(0_int8))
      print  *,  popcnt(huge(0_int16)),  poppar(huge(0_int16))
      print  *,  popcnt(huge(0_int32)),  poppar(huge(0_int32))
      print  *,  popcnt(huge(0_int64)),  poppar(huge(0_int64))
   end program demo_popcnt

STANDARD

[[Fortran 2008]] and later

CLASS

[[Elemental function]]

SEE ALSO

popcnt(3), leadz(3), trailz(3)

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poppar (3)

March 11, 2021

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