TRAILZ — Number of trailing zero bits of an integer

TRAILZ(I)

TRAILZ returns the number of trailing zero bits of an integer.

Parameters

I – Shall be of type INTEGER.

Returns

The type of the return value is the default INTEGER. If all the bits of I are zero, the result value is BIT_SIZE(I).

Standard:

Fortran 2008 and later

Class:

Elemental function

Syntax:

RESULT = TRAILZ(I)

Example:

PROGRAM test_trailz
  WRITE (*,*) TRAILZ(8)  ! prints 3
END PROGRAM

See also:

BIT_SIZE — Bit size inquiry function, LEADZ — Number of leading zero bits of an integer, POPPAR — Parity of the number of bits set, POPCNT — Number of bits set