ada question

Raziel078

So I've got this hw question and I'm pretty sure I'm missing it. I've got the notes I've read the relevant section in the book. But its still escaping me. So I'm going to post the question and my answer.

Let p be the following procedure, written using Ada syntax:

procedure P(X: in out Integer; Y: out Integer) is
begin
I := I + 1;
X := X + 1;
Y := I + 1;
end P;

I is global to this procedure. Now, suppose that the following statements are executed:
I := 1;
A(1) := 10;
A(2) := 20;
A(3) := 30;
P(I, A(I));

For each of the following sets of assumptions, show the values of I, A(1), A(2), and A(3) after the call of P.

(a) X is passed by reference and Y is passed by reference
(b) X is passed by reference and Y is passed by result
(c) X is passed by value-result and Y is passed by reference
(d) X is passed by value-result and Y is passed by result

my answer:

1. I A(1) A(2) A(3)
a 3 11 20 30
b 3 10 20 31
c 2 11 20 30
d 2 10 21 30

again I'm pretty sure this is wrong but I wasn't in class the day we went over this stuff. (took papa to the ER, so it wasn't me just being lazy). And this teacher has a really bad habit of teaching in class and not mentioning it in the notes. Thanks if you can help. Or at least explain what I did wrong.

jclast

We won't do your homework for you. You should go to office hours, explain why you weren't in class, and say something like "I tried to do the homework, and I think I'm not sure I understand. Here's what I've got. If I'm wrong could you point me in the right direction? Or maybe lead me through a similar example problem?"

Raziel078

are you kidding me? I've got my damned answer posted below it. If someone knows more about passing values I'd appreciate it. If on the other hand you just feel like sounding like a smug dick I"m uninterested in your dickery.

wasted pixels

jclast wrote: »

We won't do your homework for you. You should go to office hours, explain why you weren't in class, and say something like "I tried to do the homework, and I think I'm not sure I understand. Here's what I've got. If I'm wrong could you point me in the right direction? Or maybe lead me through a similar example problem?"

The OP is absolutely fine and kosher under the H/A rules. He's asking for someone to help him with syntax, not to give him answers.

Raziel078

I appreciate the backup wasted pixels

jclast

This is a better explanation than I could think of for the different types of passing and how they affect what variables are assigned when.

Sorry. Didn't mean to sound like a dick earlier. I just figured that the professor would be more help than random folks on the Internet.