Fortran - Re: language rules question: using a (passed in) parameter to define

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Re: language rules question: using a (passed in) parameter to define

dpb

2007-07-25, 7:08 pm

BenR wrote:
> Hello,
> I am working on a program where we send a variable defined as a
> parameter as an argument to a subroutine. In the subroutine, when I
> try to define another parameter using the parameter that was passed
> in, I get the following error:
>
> Error: This symbol must be a defined parameter or an argument of an
> inquiry function that evaluates to a compile-time constant.
> This is Compaq Fortran.
>
> so here is the structure:
>
> subroutine sub(x) !x was a parameter in the calling function
> integer x,y
> parameter(y=x+5)
> ...
> end sub
>
> Anyone know why this is behaving like this?

Because a PARAMETER must be an initialization expression and a variable
that is changeable at run time doesn't qualify.

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