some simple questions

["Daniel Sch�le" <uval@rz.uni-karlsruhe.de>]

Hi all

I am learning Ada on doing
I have found some small examples on web and
now I'm trying to put the mosaic stones together

my questions are

given
    type pint is access integer;
    pi: pint:=new integer;

how do I delete the allocated object?
free(pi);    --doesn't work
(I'm pretty sure Ada doesn't have Garabge Collector)

is there a syntax available to initialize allocated object (like in C++)?
int * pi=new int(0);
now I am doing that this way
pi.all:=0;

what is the proper way to assure that pointer points to valid object?

and last one
what's "std::system("clear");" translated to Ada
(OS Linux)

sorry if it's faq

Thanks

Daniel