Fortran PARAMETER variable initialized from input

Question

In Fortran, is the PARAMETER attribute set at runtime or compilation time? I was wondering if I can pass in the size the of the array at run time and have this

Answer 1

The value of a parameter is set at compile time.

A declaration such as

integer, parameter :: number_of_widgets = numwidge

requires that numwidge be known at compile time, indeed known before it is encountered on the rhs of the declaration.