On Fri, Feb 15, 2008 at 11:56:06AM -0800, [EMAIL PROTECTED] wrote:
I can accept that a variable is a container that a symbol points to.
That reminds me of a memory address in C. That also seems to imply
that the variable can change and hence the value associated with a symbol
can change.
What is the container/variable for this construct in C???
#define PI 3.14159
Likewise in Scheme.... (define pi 3.14159)
What about (setq pi 6)
which is perfectly valid in Scheme. Bindings in scheme are always places
that hold a value. It doesn't have the concept of a constant, just
programmers with enough discipline to not change things.
The C macro is replaced at compile time with just a number, textually in
the code. The scheme would be more equivalent to the C
float pi = 3.14159;
But still a little different, since C doesn't have symbols at run time.
There are still symbols, but they are bound to variables at compile time.
David
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