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From: "Ken Garlington" <Ken.Garlington@computer.org>
Subject: Re: if statements
Date: 2000/11/07
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Newsgroups: comp.lang.ada
Date: 2000-11-07T00:00:00+00:00
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"Daniel Allex" <dallex@erols.com> wrote in message
news:3A078B6F.D34B024B@erols.com...
: procedure Swap ( A,     B : in out Integer ) is
:       Temp : Integer := 0;
:    begin
:       if A <= B then
:          Temp := A;
:          A := B;
:          B := Temp;
:       end if;
:    end;
:
:
: sc297 wrote:
:
: > can anyone show me an if statement that will swap the values of A and B,
: > if A is the greater value

Now *I* feel like a beginning Ada student! Doesn't the proposed solution
swap A and B if A is *not* the greater value? And why is Temp assigned an
initial value of 0?

Personally, I would have gone with something more along the lines of

generic
   type Value is private;
   with function ">"(A, B : Value) return Boolean is <>;
procedure Homework_Assignment(A, B : in out Value);

-- Exchange is defined in the Ada Reference Manual
with Exchange;
procedure Homework_Assignment(A, B : in out Value) is
   procedure Swap is new Exchange(Value);
begin
   if A > B then
      Swap(A,B);
   end if;
end Homework_Assignment;

Can't you imagine how pleased the instructor will be to find out that the
student has already mastered generics?