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/GNU Fortran 5

9.44 BIT_SIZE — Bit size inquiry function

Description:
BIT_SIZE(I) returns the number of bits (integer precision plus sign bit) represented by the type of I. The result of BIT_SIZE(I) is independent of the actual value of I.
Standard:
Fortran 95 and later
Class:
Inquiry function
Syntax:
RESULT = BIT_SIZE(I)
Arguments:
I The type shall be INTEGER.
Return value:
The return value is of type INTEGER
Example:
program test_bit_size
    integer :: i = 123
    integer :: size
    size = bit_size(i)
    print *, size
end program test_bit_size

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Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-5.4.0/gfortran/BIT_005fSIZE.html