Lahey/GNU Fortran

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8.192 POPCNT — Number of bits set

Description:
POPCNT(I) returns the number of bits set ('1' bits) in the binary representation of I.
Standard:
Fortran 2008 and later
Class:
Elemental function
Syntax:
RESULT = POPCNT(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:
POPPAR, 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