Aufgaben zu Parameter-Modi (I)

Erklären Sie den Unterschied zwischen (Ada)

with Ada.Text_IO; use Ada.Text_IO;
procedure Check is
   procedure Sub (X: in out Integer;
                  Y: in out Integer;
                  Z: in out Integer) is
   begin
      Y := 8; Z := X;
   end;
   Foo: Integer := 9;   Bar: Integer := 7;
begin
   Sub (Foo,Foo,Bar);
   Put_Line (Integer'Image(Foo));
   Put_Line (Integer'Image(Bar));
end Check;

(in Datei Check.adb schreiben, kompilieren mit gnatmake Check.adb)

und (C++)

#include <iostream>

void sub (int & x, int & y, int & z) {
  y = 8;
  z = x;
}

int main () {
   int foo = 9;
   int bar = 7;

   sub (foo,foo,bar);
   std::cout << foo << std::endl;
   std::cout << bar << std::endl;
}