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Manual Reference Pages  - btest (3)

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NAME

btest(3f) - [FORTRAN:INTRINSIC:BIT MANIPULATION] Bit test function

SYNTAX

result = btest(i, pos)

DESCRIPTION

btest(i,pos) returns logical .true. if the bit at POS in I is set.

ARGUMENTS

I	The type shall be INTEGER.
POS	The type shall be INTEGER. A value of zero refers to the least significant bit.

RETURN VALUE

The return value is of type LOGICAL

EXAMPLE

Sample program:

    program demo_btest
    implicit none
    integer :: i = 32768 + 1024 + 64
    integer :: pos
    logical :: bool
        do pos=0,16
            bool = btest(i, pos)
            print *, pos, bool
        end do
    end program demo_btest

STANDARD

[[Fortran 95]] and later

CLASS

[[Elemental procedure|Elemental function]]

SEE ALSO

ibclr(3), ibits(3), ibset(3), iand(3), ior(3), ieor(3), mvbits(3)

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btest (3)

March 11, 2021

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