declare_program.adb

This contains the following topics and more ADA versus C and Cplus plus Ada_training ADA 2005 for

with Text_IO; use Text_IO;
with ada.integer_text_io; use ada.integer_text_io;
procedure declare_program_using_function is
   a : Integer := 99;
   b : Integer := 1;
   j : Integer := -99;
   package int_io is new Text_IO.Integer_IO (Integer);-- package instantiation
   function add (x : in out Integer; y : in Integer) return x is  -- procedure
      -- x and y are the formal parameters
      -- the information has to be returned to the calling environment by
      -- writing to the formal parameters using the mode OUT.
      --this will updates the actual parameters.
      i : Integer := 10;
      j : Integer := 10;
      k: Integer:=55;
   begin
      x := x + y;
      Text_IO.Put("Value of j is = ");
      int_io.Put (j);      new_line;
      put(j);-- no error bcoz of ada.integer_text_io package
      declare
         k : Integer := 50;
      begin
         Text_IO.Put ("Value of k inside declare is = ");
         int_io.Put (k);new_line;
         Text_IO.Put ("accessing the Value of k outside declare is = ");
         int_io.Put (add.k);
         Text_IO.New_Line;
      end;
	int_io.Put (j);new_line;
      int_io.Put (declare_program.j);new_line;
   end add;
begin
   add (a, b);-- a and b are the actual parameters
   Text_IO.Put ("Value of a is = ");
   int_io.Put (a);
   --   Text_IO.Put_Line ("Value of i is = ");
   --  int_io.Put (i);
end declare_program;