Re: Need Help On Ada95 Problem

["Alex" <alex@foo.invalid>]

Robert A Duff wrote:

> Writing the translation table is the
> homework assignment, and String makes no sense for that.
> But I might have misunderstood.

You may be right. The OP's post said the assignment was to

"Complete the function Encrypt(PIN) that takes a 4-digit PIN (as a
string) and returns the corresponding 4-letter code (also as a
string)"

so I assumed the translation table was also a string, given as part of
the provided code and local to the function. If it's not, and the
student is supposed to provide the mapping, then there are definitely
better options than using a string.

I'm curious about your code sample:

X : String(0 .. -1000);

I tried it and it works, but I don't understand how it's possible.
String is defined in ARM 3.6.3 as

type String is array(Positive range <>) of Character;

and your range is definitely outside of Positive. If I try 

X : String(0 .. 500); 

I get the expected compiler error. What's going on that allows the
range to be from 0 to a negative number?