len in Fortran Wiki

## Description
Returns the length of a character string. If `string` is an array,
the length of an element of `string` is returned. Note that
`string` need not be defined when this intrinsic is invoked, since
only the length, not the content, of `string` is needed.
## Standard
[[FORTRAN 77]] and later, with `kind` argument [[Fortran 2003]] and later
## Class
[[Inquiry function]]
## Syntax
`l = len(string [, kind])`
## Arguments
 - `string` - Shall be a scalar or array of type
`character`, with `intent(in)`
 - `kind` - (Optional) An `integer` initialization
expression indicating the kind parameter of the result.
## Return value
The return value is of type `integer` and of kind `kind`. If
`kind` is absent, the return value is of default integer kind.
## See also
[[len_trim]], [[adjustl]], [[adjustr]]
category: intrinsics