我陷入了艾达。我应该创建一个具有特定Flag_Type的包,可以将其写入和读取以便打印一个简单的标记。我想以为我已经成功地使软件包广告和软件包主体adb正确了,但是我在主程序的命令上苦苦挣扎。
首先是第一,输出应该看起来像这样:
Enter the flag name: Italys flag
Enter the flag height: 2
Enter the stripes width: 3
Enter the flags colors: GWR
Italys flag
+---------+
|GGGWWWRRR|
|GGGWWWRRR|
+---------+
现在,我的包裹ADS看起来像这样:
with Ada.Text_IO; use Ada.Text_IO;
with Ada.Integer_Text_IO; use Ada.Integer_Text_IO;
with Ada.Float_Text_IO; use Ada.Float_Text_IO;
package Flagdrawer is
type Flag_Type is private;
procedure Get(Item: out Flag_Type);
procedure Put(Item: in Flag_Type);
private
type Flag_Type is
record
Flag_Name: String(1..20);
L : Integer;
Flag_Height : Integer;
Flag_Width : Integer;
Flag_Colors : String(1..3);
end record;
end Flagdrawer;
我的包体看起来像这样:
with Ada.Text_IO; use Ada.Text_IO;
with Ada.Integer_Text_IO; use Ada.Integer_Text_IO;
with Ada.Float_Text_IO; use Ada.Float_Text_IO;
with Flagdrawer; use Flagdrawer;
package body Flagdrawer is
procedure Get(Item: out Flag_Type) is
begin
Get_Line(Item.Flag_Name, Item.L);
Get(Item.Flag_Height);
Get(Item.Flag_Width);
Get(Item.Flag_Colors);
end Get;
procedure Put(Item: in Flag_Type) is
Real_Width : Integer;
begin
Real_Width := Item.Flag_Width *3;
Put(Item.Flag_Name(1..Item.L));
New_Line;
Put("+");
for I in 1..Real_Width loop
Put("-");
end loop;
Put_Line("+");
for J in 1..Item.Flag_Height loop
Put("!");
for K in 1..Item.Flag_Width loop
Put(Item.Flag_Colors(1));
end loop;
for L in 1..Item.Flag_Width loop
Put(Item.Flag_Colors(2));
end loop;
for M in 1..Item.Flag_Width loop
Put(Item.Flag_Colors(3));
end loop;
Put_Line("!");
end loop;
Put("+");
for I in 1..Real_Width loop
Put("-");
end loop;
Put_Line("+");
end Put;
end Flagdrawer;
然后我非常缺乏的主程序如下所示:
with Ada.Text_IO; use Ada.Text_IO;
with Ada.Integer_Text_IO; use Ada.Integer_Text_IO;
with Ada.Float_Text_IO; use Ada.Float_Text_IO;
with Flagdrawer; use Flagdrawer;
procedure Tenta_Flagdrawah is
F: Flag_Type;
begin
Put_line("Enter the flags name (1): ");
Put_Line("Enter the flags height (2): ");
Put_Line("Enter the stripes' width (3): ");
Put_Line("Enter the RGB for the flag's colors (4): ");
Get(F);
New_Line;
Put(F);
end Tenta_Flagdrawah;
Im仅用于具有特定输入的分配,可以说Get(F),其中F是Flag_Type,现在它分布在多个变量中,我不知道如何合并它们。
过去,我一直在这里得到良好的回应,有没有人可以给我一些有关Im在哪里过错的提示?我知道我的主程序严重缺乏,但我不知道如何编写它。
在此先感谢您的帮助!
编辑
我找到了一个可行的解决方案(某种程度上),该解决方案在我直接针对Simon Wright的主程序中被注释掉了,因为我没有完全理解您的声明含义。我将它们放入我的MP中,并且不断收到“项目的实际值必须是变量”。我尝试使用Item.Name代替,但是它声明了无效的前缀。你觉得我哪里出问题了?
主程序.adb
with Ada.Text_IO; use Ada.Text_IO;
with Ada.Integer_Text_IO; use Ada.Integer_Text_IO;
with Ada.Float_Text_IO; use Ada.Float_Text_IO;
with Flagdrawer; use Flagdrawer;
procedure Tenta_Flagdrawah is
F: Flag_Type;
subtype Color_String is String (1 .. 3);
procedure Get (Item : out Flag_Type;
Name : in String;
Height : in Natural;
Stripe_Width : in Natural;
Colors : in Color_String) is
begin
Put("Enter the flag's name: ");
Get(Name);
Put("Enter the flag's height: ");
Get(Height);
end Get;
begin
-- Put_line("Enter the flags name (1): ");
-- Put_Line("Enter the flags height (2): ");
-- Put_Line("Enter the stripes' width (3): ");
-- Put_Line("Enter the RGB for the flag's colors (4): ");
-- Get(F);
New_Line;
Put(F);
end Tenta_Flagdrawah;
Same method as in the previous post (see here), just add the user input logic:
main.adb
输出
A lot of your trouble is the
Get
procedure; it implements all the text input for the various fields without reference to whatever the main program’s doing.In general, it isn’t good practice to do I/O within an abstract data type like
Flag
; much better to do it in the calling program. (I can see that’d be awkward forPut
).You could read the parameters in the main program and supply them to
Get
,