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/GNU Fortran 7

9.215 POPPAR — Parity of the number of bits set

Description:

POPPAR(I) returns parity of the integer I, i.e. the parity of the number of bits set (’1’ bits) in the binary representation of I. It is equal to 0 if I has an even number of bits set, and 1 for an odd number of ’1’ bits.

Standard:

Fortran 2008 and later

Class:

Elemental function

Syntax:

RESULT = POPPAR(I)

Arguments:
I Shall be of type INTEGER.
Return value:

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

See also:

POPCNT, LEADZ, TRAILZ

Example:
program test_population
  print *, popcnt(127),       poppar(127)
  print *, popcnt(huge(0_4)), poppar(huge(0_4))
  print *, popcnt(huge(0_8)), poppar(huge(0_8))
end program test_population

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Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gfortran/POPPAR.html