Manual Reference Pages - bit_size (3fortran)
BIT_SIZE(3) - [BIT:INQUIRY] Bit size inquiry function
SYNOPSIS
result = bit_size(i)
integer(kind=KIND) function bit_size(i)integer(kind=KIND),intent(in) :: i(..)
CHARACTERISTICS
o I shall be of type integer. It may be a scalar or an array. o the value of KIND is any valid value for an integer kind parameter on the processor. o the return value is a scalar of the same kind as the input value.
DESCRIPTION
BIT_SIZE(3) returns the number of bits (integer precision plus sign bit) represented by the type of the integer I.
OPTIONS
o I : An integer value of any kind whose size in bits is to be determined. Because only the type of the argument is examined, the argument need not be defined; I can be a scalar or an array, but a scalar representing just a single element is always returned.
RESULT
The number of bits used to represent a value of the type and kind of i. The result is a integer scalar of the same kind as i.
EXAMPLES
Sample program:
program demo_bit_size use,intrinsic :: iso_fortran_env, only : int8, int16, int32, int64 use,intrinsic :: iso_fortran_env, only : integer_kinds implicit none character(len=*),parameter :: fmt=& & ’(a,": bit size is ",i3," which is kind=",i3," on this platform")’Typical Results:! default integer bit size on this platform write(*,fmt) "default", bit_size(0), kind(0)
write(*,fmt) "int8 ", bit_size(0_int8), kind(0_int8) write(*,fmt) "int16 ", bit_size(0_int16), kind(0_int16) write(*,fmt) "int32 ", bit_size(0_int32), kind(0_int32) write(*,fmt) "int64 ", bit_size(0_int64), kind(0_int64)
write(*,’(a,*(i0:,", "))’) "The available kinds are ",integer_kinds
end program demo_bit_size
> default: bit size is 32 which is kind= 4 on this platform > int8 : bit size is 8 which is kind= 1 on this platform > int16 : bit size is 16 which is kind= 2 on this platform > int32 : bit size is 32 which is kind= 4 on this platform > int64 : bit size is 64 which is kind= 8 on this platform > The available kinds are 1, 2, 4, 8, 16
STANDARD
Fortran 95
SEE ALSO
Fortran intrinsic descriptions (license: MIT) @urbanjost
o BTEST(3) - Tests a bit of an integer value. o STORAGE_SIZE(3) - Storage size in bits
| Nemo Release 3.1 | bit_size (3fortran) | November 02, 2024 |
