这篇文章是上一篇文章的后续:
我正在尝试创建一个名为 的对象Configuration
,将其打印在屏幕上,以便我可以看到它的内容并尝试访问这个创建的对象的组件。这是给我带来麻烦的最后一部分。代码如下:
首先是包装规格Rectangular_Method.ads
:
package Rectangular_Method is
type Rectangular is private;
function Construct(Horz, Vert : Long_Float) return Rectangular;
procedure Print(Configuration: in Rectangular);
procedure Vector_Basis_r (A : in Long_Float; D : out Rectangular);
function Get_Horz (R : Rectangular) return Long_Float;
function Get_Vert (R : Rectangular) return Long_Float;
private
type Rectangular is
record
Horz, Vert: Long_Float;
end record;
end Rectangular_Method;
接下来,包体Rectangular_Method.adb
:
with Ada.Text_IO, Ada.Long_Float_Text_IO;
with Ada.Numerics.Long_Elementary_Functions;
use Ada.Numerics.Long_Elementary_Functions;
package body Rectangular_Method is
function Construct(Horz, Vert : Long_Float) return Rectangular is
begin
return(Horz, Vert);
end Construct;
procedure Print(Configuration: in Rectangular) is
use Ada.Text_IO, Ada.Long_Float_Text_IO;
begin
Put("(");
Put(Configuration.Horz, Fore => 2, Aft => 2, Exp => 0); Put(", ");
Put(Configuration.Vert, Fore => 2, Aft => 2, Exp => 0);
Put_Line(")");
end Print;
procedure Vector_Basis_r (A : in Long_Float; D : out Rectangular) is
begin
D.Horz := Cos (A, Cycle => 360.0);
D.Vert := Sin (A, Cycle => 360.0);
end Vector_Basis_R;
function Get_Horz (R : Rectangular) return Long_Float is
begin
return R.Horz;
end Get_Horz;
function Get_Vert (R : Rectangular) return Long_Float is
begin
return R.Vert;
end Get_Vert;
end Rectangular_Method;
最后是测试文件test_rectangular_form.adb
:
with Ada.Long_Float_Text_IO;
with Ada.Text_IO; use Ada.Text_IO;
with Rectangular_Form;
use type Rectangular_Form.Rectangular;
procedure Test_Rectangular_Form is
Theta : Long_Float;
Basis_r : Rectangular_Form.Rectangular;
Configuration: Rectangular_Form.Rectangular;
begin
Ada.Text_IO.Put("Enter the angle ");
Ada.Long_Float_Text_IO.Get (Item => theta);
--Vector basis
Rectangular_Form.Vector_Basis_R (A => Theta, D => Basis_R);
Configuration := Rectangular_Form.Construct(Rectangular_Form.Get_Horz (Basis_R),Rectangular_Form.Get_Vert (Basis_R));
Ada.Text_IO.New_Line;
Rectangular_Form.Print(Configuration);
end Test_Rectangular_Form;
现在的问题(基于test_rectangular_form.adb
):
I have created an object Configuration
as shown above holding the horizontal and vertical components of Basis_R. If I want to access say the horizontal component of Configuration
, the following doesn't work:
aa := Rectangular_Form.Configuration.Rectangular.Horz;
(after defining aa
to be of type Long_Float)
I have tried various expressions to access the components of the object Configuration
but in vain.
Any help would be most appreciated.
Thanks...