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Manual Reference Pages  - popcnt (3)

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NAME

popcnt(3f) - [FORTRAN:INTRINSIC:BIT INQUIRY] Number of bits set

SYNTAX

result = popcnt(i)

DESCRIPTION

Returns the number of bits set in the binary representation of an integer.

ARGUMENTS

I	Shall be of type INTEGER.

RETURN VALUE

The return value is of type ’integer’ and of the default integer kind.

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)), poppar(huge(0))
     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

Sample output:

7

31	7
15	31 63

STANDARD

[[Fortran 2008]] and later

CLASS

[[Elemental function]]

SEE ALSO

poppar(3), leadz(3), trailz(3)

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popcnt (3)

March 11, 2021

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