c_sizeof in Fortran Wiki

## Description
`c_sizeof(x)` calculates the number of bytes of storage the
expression `x` occupies.
## Standard
[[Fortran 2008]]
## Class
Intrinsic function
## Syntax
~~~~~~~~~~~~~~~~~~~~~ {: lang=fortran }
n = c_sizeof(x)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
## Arguments
 - `x` - The argument shall be an interoperable data entity.
## Return value
The return value is of type integer and of the system-dependent kind
`c_size_t` (from the [[iso_c_binding]] module). Its value is the
number of bytes occupied by the argument. If the argument has the
`pointer` attribute, the number of bytes of the storage area pointed
to is returned. If the argument is of a derived type with `pointer`
or `allocatable` components, the return value does not account for
the sizes of the data pointed to by these components.
## Example
~~~~~~~~~~~~~~~~~~~~~ {: lang=fortran }
use iso_c_binding
integer(c_int) :: i
real(c_float) :: r, s(5)
print *, (c_sizeof(s)/c_sizeof(r) == 5)
end
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The example will print `.true.` unless you are using a platform
where default `real` variables are unusually padded.
## See also
[[storage_size]]
category: intrinsics