On Tue, 2009-08-04 at 01:58 +0400, Hiisi wrote:
> Dear All!
> Sorry for this off-topic, but I could not see any solution to my
> problem. I'm trying to transform old Algol 60 program to C++. I can
> understand every syntax of it except this construction:
> D(N+1):=N(N+2):=0.0;
>
> Variables types:
> N - INTEGER
> D - REAL ARRAY
> What is it? How to represent in C++? Hope on this list there's people,
> who could remember that from the time...
> Thanks in advance!
Something is very hokey here. At first glance it looks like a double
assignment. However Algol requires arrays to be specified and used with
square brackets. So "D(N+1)" looks like it's meaningless since D is
declared to be an array; the form could be either a function or a
product, depending on how D is declared. "N(N+1)" has to be a product.
But neither of them is an l-value -- they can't be assigned to.
There's a small example of Algol-60 at:
http://en.wikipedia.org/wiki/Trabb_Pardo-Knuth_algorithm
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