Re: Passed by Reference vs. Passed by Value

Jon? wrote:
In which case, the variabkle is copied to a new location and *pointer to
new location* is passed to procedure.
In the end, you always passed a pointer under covert...

Dave wrote:
I used to think that. But then I ran into the situation where one

program was passing a parameter by reference (by default) but the called
program expected the parameter to be passed by value (explicitly) and the
called program couldn't see the passed value at all. Explain to me why is

that? Thanks for the education.

I (Kevin) write:
A *program* *always* receives its parameters by reference.
A *procedure* can receive its parameters either by value or by reference.
If it is expecting by value but actually gets by reference then what
occurs is probably undefined. There must be a mismatch between the caller
and the called, ie "lying" to the compiler / binder at one point or the
other.

Hope this helps.

Kevin Wright
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