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Manual Reference Pages  - bgt (3fortran)

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NAME

BGT(3) - [BIT:COMPARE] Bitwise greater than

SYNOPSIS

result = bgt(i, j)

          elemental logical function bgt(i, j)

           integer(kind=**),intent(in) :: i
           integer(kind=**),intent(in) :: j

CHARACTERISTICS

o	I is an integer or a boz-literal-constant.
o	J is an integer or a boz-literal-constant.
o	a kind designated as ** may be any supported kind for the type The integer kind of I and J may not necessarily be the same. kind. In addition, values may be a BOZ constant with a value valid for the integer kind available with the most bits on the current platform.
o	The return value is of type logical and of the default kind.

DESCRIPTION

BGT determines whether an integer is bitwise greater than another. Bit-level representations of values are platform-dependent.

OPTIONS

o	I : reference value to compare against
o	J : value to compare to I

RESULT

The return value is of type logical and of the default kind. The result is true if the sequence of bits represented by i is greater than the sequence of bits represented by j, otherwise the result is false.

Bits are compared from right to left.

EXAMPLES

Sample program:

    program demo_bgt
    use,intrinsic :: iso_fortran_env, only : int8, int16, int32, int64
    implicit none
    integer            :: i
    integer(kind=int8) :: byte
      ! Compare some one-byte values to 64.
       ! Notice that the values are tested as bits not as integers
       ! so sign bits in the integer are treated just like any other
       write(*,’(a)’) ’we will compare other values to 64’
       i=64
       byte=i
       write(*,’(sp,i0.4,*(1x,1l,1x,b0.8))’)i,bgt(byte,64_int8),byte

       write(*,’(a)’) "comparing at the bit level, not as whole numbers."
       write(*,’(a)’) "so pay particular attention to the negative"
       write(*,’(a)’) "values on this two’s complement platform ..."
       do i=-128,127,32
          byte=i
          write(*,’(sp,i0.4,*(1x,1l,1x,b0.8))’)i,bgt(byte,64_int8),byte
       enddo

       ! see the BGE() description for an extended description
       ! of related information

    end program demo_bgt

Results:

     > we will compare other values to 64
     > +0064  F 01000000
     > comparing at the bit level, not as whole numbers.
     > so pay particular attention to the negative
     > values on this two’s complement platform ...
     > -0128  T 10000000
     > -0096  T 10100000
     > -0064  T 11000000
     > -0032  T 11100000
     > +0000  F 00000000
     > +0032  F 00100000
     > +0064  F 01000000
     > +0096  T 01100000

STANDARD

Fortran 2008

SEE ALSO

BGE(3), BLE(3), BLT(3)

fortran-lang intrinsic descriptions (license: MIT) @urbanjost

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Nemo Release 3.1

bgt (3fortran)

April 28, 2024

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