Re: help Please

[Matthew Heaney <matthew_heaney@acm.org>]

rross@postoffice.ptd.net (bob) writes:

> hey, i am a student and i cant seem to figure this out:
> we are to add two integer numbers together , assuming that the
> computer
> doesnt know how to add.  for example , you read two integers into an
> array
> of characters each.
> then you add the numbers together in a for loop:
> 
> for a in reverse (1..10) loop
> 	--Z is the 3rd array or result array
> 	Z(a) := A(a)+B(a)+carry;
> 
> something like that, where carry is if you have a sum of more than 10,
> which is decided in an if statement later in the loop
> 
> my problem is: we are supposed to use array A and B as type
> characters.
> you cant add two characters and you cant typecast them to integers, so
> how
> do u get the result of the sums into Z?
> any help on this would be greatly appreciated
> thanks in advance

If you want to add two characters together, then just define an operator
to do that:

 function "+" (L, R : Character) return Character is ...;

You can't "typecast" a character to integer, like this

     ... Integer (C) ...

but of course you can convert a character into its underlying integer
representation either by using Unchecked_Conversion or Character'Pos.